Topless relations briefly corner actor? (5)
I believe the answer is:
extra
'actor?' is the definition.
(extra is a type of actor)
'topless relations briefly corner' is the wordplay.
'topless relations' becomes 'ex' (I can't explain this - if you can you should give a lot more credence to this answer).
'briefly' means to remove the last letter.
'corner' becomes 'trap' (I've seen this in another clue).
'trap' with its final letter taken off is 'tra'.
'ex'+'tra'='EXTRA'
Can you help me to learn more?
(Other definitions for extra that I've seen before include "person in shot?" , "Player taking little part" , "Actor's part" , "Minor person screened" , "Player with no lines" .)