Mounting desire to be in photo troubled centre of attraction (8)
I believe the answer is:
honeypot
'centre of attraction' is the definition.
(I've seen this before)
'mounting desire to be in photo troubled' is the wordplay.
'mounting' shows that the letters should be reversed in order (going up in a down clue).
'desire' becomes 'yen' (yen is a kind of desire**).
'to be in' is an insertion indicator.
'troubled' indicates an anagram.
'yen' back-to-front is 'ney'.
'photo' anagrammed gives 'hopot'.
'ney' put within 'hopot' is 'HONEYPOT'.
(Other definitions for honeypot that I've seen before include "place attracting many?" , "Winnie the Pooh's jar?" , "attractive thing" , "Centre of attraction" , "Mecca?" .)