Attitude I put on for sea god (8)
I believe the answer is:
poseidon
'sea god' is the definition.
(Greek god of the sea)
'attitude i put on' is the wordplay.
'attitude' becomes 'pose' (attitude can mean a pose or stance).
'put on' becomes 'don' (as in donning or putting on an item of clothing).
'pose'+'i'+'don'='POSEIDON'
'for' is the link.
(Other definitions for poseidon that I've seen before include "Poisoned the Greek god of the sea" , "Controller of the main" , "I snooped to find Greek god of the sea" , "Greek sea-god" , "underwater missile" .)