Underwear found in shopping area aboard ship (6)
I believe the answer is:
smalls
'underwear' is the definition.
(type of underwear)
'shopping area aboard ship' is the wordplay.
'shopping area' becomes 'mall' (shopping mall).
'aboard' indicates putting letters inside.
'ship' becomes 'SS' (prefix in ship names eg SS Great Britain).
'mall' put inside 'ss' is 'SMALLS'.
'found in' acts as a link.
(Other definitions for smalls that I've seen before include "Slips perhaps" , "Underclothes" , "Undersized underwear?" , "Diminutive articles of underwear?" , "Diminutive undergarments?" .)