Greek god found in Homer, ostensibly (4)
I believe the answer is:
eros
'greek god' is the definition.
(Eros is an example)
'in homer ostensibly' is the wordplay.
'in' says the answer is hidden in the clue.
'EROS' is hidden within 'homer ostensibly'.
'found' is the link.
(Other definitions for eros that I've seen before include "Rose for the love-god" , "Famous statue in Piccadilly, London" , "Cupid's Greek alternative" , "God of love; life instinct (Freud)" , "Cupid, to the Greeks" .)