Old chap in short coat (4)
I believe the answer is:
cove
'old chap' is the definition.
(old-fashioned term for a man)
'short coat' is the wordplay.
'short' means to remove the last letter.
'coat' becomes 'cover'.
'cover' with its final letter taken away is 'COVE'.
'in' is the link.
(Other definitions for cove that I've seen before include "Small bay or coastal inlet" , "Bloke; bay" , "Small sheltered bay - man (old slang)" , "A small sea inlet or slangy man" , "where the sea comes in" .)