Heard of maybe Bohemian couple's last move (9)
I believe the answer is:
checkmate
'last move' is the definition.
(final move in chess)
'heard of maybe bohemian couple's' is the wordplay.
'heard of' shows a homophone (sound like).
'maybe bohemian' becomes 'Czech' (Bohemia is part of the Czech Republic).
'couple' becomes 'mate' (synonyms).
'czech' sounds like 'check'.
'check'+'mate'='CHECKMATE'
(Other definitions for checkmate that I've seen before include "final defeat" , "ending on board" , "Inescapable attack in chess" , "Conclusion of chess game" , "Complete victory" .)