Greek god circling close to Troy in attempt to deceive (3,2,2)
I believe the answer is:
try it on
'attempt to deceive' is the definition.
(I've seen this before)
'greek god circling close to troy' is the wordplay.
'greek god' becomes 'triton' (Triton is an example**).
'circling' is an insertion indicator (circling can mean going around or containing).
'close to' indicates one should take the final letters (the close/ending of).
The final letter of 'troy' is 'y'.
'triton' going around 'y' is 'TRY IT ON'.
'in' acts as a link.
(Other definitions for try it on that I've seen before include "test a new suit" , "trick" , "Attempt to be provocative (colloq.)" , "Before buying a garment, you should" , "Be cheeky" .)