Persistently nag male Hollywood actor about end of western (7)
I believe the answer is:
'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'.
(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)" .)