Small boat making for island (4)
I believe the answer is:
sark
'for island' is the definition.
(I've seen this before)
'small boat' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'boat' becomes 'ark' (ark is a kind of boat).
's'+'ark'='SARK'
'making' is the link.
(Other definitions for sark that I've seen before include "One of Channel Isles" , "One of the Channel Islands" , "Hereditarily-ruled Channel Island" , "Shirt (Sc.); Ch. island" , "See 4 Down" .)