Latin Square - solution

Below the break is the solution and notes for Latin Square.

Latin Square

Drinks Reception - solution

Below the break is the solution and notes for Drinks Reception.

Drinks Reception

In each across clue the wordplay indicates the answer plus an extra letter that is not entered in the grid. In clue order, these letters give an informal definition of a thematic word. Solvers should highlight in the grid four alternative definitions of this word (all of which are single words, none consisting entirely of a single clue answer), to form symbolic representations of the informal definition. Online solvers can double-click in a cell to highlight it.
All answers are in Chambers Dictionary; not all have their own entry but all can be found at Quinapalus's Word Matcher.

The Prince and the Showgirl - solution

Below the break is the solution and notes for The Prince and the Showgirl.

The Prince and the Showgirl

Four answers are friends of 28, and are not further defined in their clues.
Across
Down
All defined answers are in Collins Dictionary except for the common phrase at 16 and a derivative form.

Blockbuster – solution

Below the break is the solution and notes for Blockbuster.

Blockbuster

Solvers must add five extra blocks to the grid. For down entries these blocks separate the two answers to each of five down clues, which are really two clues side-by-side (in either order). In across entries the extra blocks contain multiple letters of answers which would not otherwise fit. In each of the corresponding across clues one letter from the block's contents is omitted from the wordplay: these letters can be arranged to give the name of the protagonist. Solvers should mark the extra blocks in the grid using an appropriate symbol. Numbers in brackets are the total lengths of their clue answers; individual answers consisting of more than one word are indicated. All answers can be found in Collins Dictionary except one unusually-formed adjective found in The Chambers Dictionary and one phrase found in Chambers and at dictionary.com.