Kid left an overcoat (6)
I believe the answer is:
raglan
'overcoat' is the definition.
(thesaurus)
'kid left an' is the wordplay.
'kid' becomes 'rag' (I've seen this in other clues).
'left' becomes 'l' (common abbreviation).
'rag'+'l'+'an'='RAGLAN'
(Other definitions for raglan that I've seen before include "coat with unique sleeves" , "Br. Crimean commander; overcoat" , "Crimean commander; type of coat" , "old military leader" , "overcoat without shoulder seams" .)