Discuss possibly sleeping over on edges on terrace (6)
I believe the answer is:
debate
'discuss' is the definition.
(I know that debate is a more specific form of the action consider)
'sleeping over on edges on terrace' is the wordplay.
'sleeping' becomes 'abed' (I've seen this before).
'over' shows that the letters should be reversed in order.
'on' is a charade indicator (letters next to each other).
'edges on' means to remove the middle letters.
'terrace' with its middle removed is 'te'.
'abed' reversed gives 'deba'.
'deba'+'te'='DEBATE'
'possibly' is the link.
(Other definitions for debate that I've seen before include "Discuss; argue" , "Formal discussion through argument" , "Argue a point" , "consideration" , "Discussion throung argument" .)