Western man's agent recalled rumour (7)
I believe the answer is:
whisper
'rumour' is the definition.
(I've seen this before)
'western man's agent recalled' is the wordplay.
'western' becomes 'w'.
'man's' becomes 'his'.
'agent' becomes 'rep' (short for representative).
'recalled' says the letters should be written backwards.
'rep' reversed gives 'per'.
'w'+'his'+'per'='WHISPER'
(Other definitions for whisper that I've seen before include "Talk very quietly" , "Speak very quietly" , "Soft voice" , "Speak or utter very softly" , "Speak in a low voice" .)