American in resort tailored garment (8)
I believe the answer is:
trousers
'garment' is the definition.
(trousers is a kind of garment)
'american in resort tailored' is the wordplay.
'american' becomes 'us' (abbreviation for United States).
'in' indicates putting letters inside.
'tailored' indicates anagramming the letters (the letters are customised ).
'resort' is an anagram of 'troers'.
'us' inserted within 'troers' is 'TROUSERS'.
(Other definitions for trousers that I've seen before include "Slacks" , "Garment (worn by the one in control?)" , "flies here" , "Outer garment" , "Longs" .)