Couple standing up in photo, ready for sex? (7)
I believe the answer is:
priapic
'ready for sex?' is the definition.
(priapic can mean with a constant erection)
'couple standing up in photo' is the wordplay.
'couple' becomes 'pair' (synonyms).
'standing up' says the letters should be written backwards (in a down clue up is reverse order).
'in' is an insertion indicator.
'photo' becomes 'pic' (I've seen this in other clues).
'pair' written backwards gives 'riap'.
'riap' placed within 'pic' is 'PRIAPIC'.
(Another definition for priapic that I've seen is " Relating to male virility".)