About to set a problem for the rest (6)
I believe the answer is:
repose
'the rest' is the definition.
('repose' can be a synonym of 'rest')
'about to set' is the wordplay.
'about' becomes 're' (regarding).
'to set' becomes 'pose' (posing is a kind of setting).
're'+'pose'='REPOSE'
'a problem for' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for repose that I've seen before include "peace" , "place" , "Relaxation" , "State of tranquillity" , "Lie at rest" .)