The others tie up, reversing for convenience? (4,4)
I believe the answer is:
rest room
'convenience?' is the definition.
('rest room' can be a synonym of 'convenience')
'the others tie up reversing' is the wordplay.
'the others' becomes 'rest' (I've seen this in other clues).
'tie up' becomes 'moor' (I've seen this before).
'reversing' says the letters should be written in reverse.
'moor' back-to-front is 'room'.
'rest'+'room'='REST ROOM'
'for' acts as a link.
(Other definitions for rest room that I've seen before include "Polite toilet in a public building - relax in it" , "Public toilet (US)" , "American can" , "Lavatory" , "Comfort station" .)