When Hamlet duels with Laertes in "Hamlet"

ACTV

["Think about the major sections of a play and how numbers can be represented with letters."]

This clue refers to the final sword fight between Hamlet and Laertes in Shakespeare’s Hamlet, which happens in Act 5 of the play. The answer "ACTV" is a play on "Act V" (the Roman numeral for 5), cleverly written as letters instead of "Act 5" to fit crossword style. It’s a common crossword trick to use Roman numerals spelled out as letters for brevity.