Attack a lecherous man (4)
I believe the answer is:
goat
I believe this is a double definition.
'attack' is the first definition.
(go at)
'a lecherous man' is the second definition.
(Other definitions for goat that I've seen before include "Domesticated animal supplying milk, meat and wool" , "lecher" , "Beast (of Capricorn)" , "Horned beast" , "lecherous sort" .)