One crew entertained by sailor having returned dress (7)
I believe the answer is:
raiment
'dress' is the definition.
(synonyms)
'one crew entertained by sailor having returned' is the wordplay.
'one' becomes 'i' (Roman numeral).
'crew' becomes 'men' (both can mean a group of workers).
'entertained by' means one lot of letters goes inside another (inserted letters are hosted or entertained).
'sailor' becomes 'tar' (term for a sailor).
'having returned' shows that the letters should be reversed in order.
'tar' back-to-front is 'rat'.
'i'+'men'='imen'
'imen' going into 'rat' is 'RAIMENT'.
(Other definitions for raiment that I've seen before include "Clothing (archaic)" , "clothing for poets" , "Fancy clothes seen on minaret" , "Clothing (poetically)" , "Attire" .)