Shout “The woman in red!” (6)
I believe the answer is:
cherry
'red' is the definition.
(shade of red)
'shout the woman in' is the wordplay.
'shout' becomes 'cry' (synonyms).
'the woman' becomes 'her' ('her' refers to a woman).
'in' is an insertion indicator.
'cry' enclosing 'her' is 'CHERRY'.
(Other definitions for cherry that I've seen before include "Morello-flavoured liqueur" , "Greyfriars Bob" , "Small red stone-fruit from tree" , "Virginity (slang)" , "Bright red" .)