Swimmer with gold, clothed by a fashion designer (8)
I believe the answer is:
aquanaut
'swimmer' is the definition.
(aquanaut is a kind of swimmer)
'with gold clothed by a fashion designer' is the wordplay.
'with' means one lot of letters goes inside another.
'gold' becomes 'Au' (Au is the chemical symbol for gold).
'clothed by' becomes 'a' (I can't justify this - if you can you should give a lot more credence to this answer).
'a fashion designer' becomes 'quant' (I've seen this before).
'a'+'quant'='aquant'
'au' put inside 'aquant' is 'AQUANAUT'.
Can you help me to learn more?
(Another definition for aquanaut that I've seen is " Diver".)