Gather in most of tough clothing (7)
I believe the answer is:
harvest
'gather in' is the definition.
(thesaurus)
'most of tough clothing' is the wordplay.
'most of' means to remove the last letter.
'tough' becomes 'hard' ('hard' is associated in meaning with 'tough').
'clothing' becomes 'vest' (vest is a kind of clothing**).
'hard' with its final letter removed is 'har'.
'har'+'vest'='HARVEST'
(Other definitions for harvest that I've seen before include "Crop-gathering time" , "seasonal collection" , "Gather in (a crop)" , "Cut down" , "Crops gathered in" .)