Fancy a cry (7)
I believe the answer is:
whimper
'cry' is the definition.
(whimpering is a kind of crying)
'fancy a' is the wordplay.
'fancy' becomes 'whim' (I've seen this before).
'a' becomes 'per'.
'whim'+'per'='WHIMPER'
(Other definitions for whimper that I've seen before include "Sob" , "Cry feebly or plaintively" , "Cry weakly or softly" , "Snivel" , "Complaint" .)