Garment with awfully neat crotch (6,4)
I believe the answer is:
trench coat
'garment' is the definition.
(trench coat is a kind of garment)
'awfully neat crotch' is the wordplay.
'awfully' is an anagram indicator.
'neat'+'crotch'='neatcrotch'
'neatcrotch' is an anagram of 'TRENCH-COAT'.
'with' acts as a link.
(Other definitions for trench coat that I've seen before include "military-style fashion" , "Military-style garment" , "Military rainwear" , "waterproof garment" , "item of clothing" .)