Persistently nag male Hollywood actor about end of western (7)
I believe the answer is:
henpeck
'persistently nag' is the definition.
'male hollywood actor about end of western' is the wordplay.
'male' becomes 'he' (**).
'hollywood actor' becomes 'peck' (Gregory Peck).
'about' is a charade indicator (letters next to each other).
'end of' says to take the final letters.
The final letter of 'western' is 'n'.
'peck' after 'n' is 'npeck'.
'he'+'npeck'='HENPECK'
(Other definitions for henpeck that I've seen before include "Browbeat" , "Nag like domineering wife or farmyard fowl" , "Harass (husband)" , "Nag a husband" , "(Of a woman) continually criticise (a husband)" .)