Stoop when Hamlet, say, mentioned? (5)
I believe the answer is:
deign
'stoop' is the definition.
(to deign is to stoop to something beneath oneself)
'hamlet say mentioned?' is the wordplay.
'hamlet say' becomes 'dane' (Hamlet is Prince of Denmark).
'mentioned?' shows a homophone (sound like) (I've seen 'mentioned' mean this).
'dane' is a homophone of 'DEIGN'.
'when' is the link.
(Other definitions for deign that I've seen before include "Seem supercilious" , "Think appropriate" , "consent" , "Lower oneself" , "See fit" .)