Rabbit caught by deerstalker? (4)
I believe the answer is:
chat
'rabbit' is the definition.
(I've seen this before)
'caught by deerstalker?' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'by' is a charade indicator (letters next to each other).
'deerstalker?' becomes 'hat' (deerstalker is a kind of hat).
'c'+'hat'='CHAT'
(Other definitions for chat that I've seen before include "flier" , "Informal conversations" , "Natter" , "Small songbird of the thrush family" , "A bird; converse" .)