John noticed my colleague offers unfinished business (5,4)
I believe the answer is:
loose ends
'unfinished business' is the definition.
(I've seen this before)
'john noticed my colleague' is the wordplay.
I cannot really see how this works, but
'john' could be 'loo' (both can mean a toilet) and 'loo' is present in the answer.
'noticed' could be 'seen' (I've seen this before) and 'seen' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'offers' is the link.
Can you help me to learn more?
(Other definitions for loose ends that I've seen before include "Unfinished business" , "items to be settled" , "details yet to be explained" .)