Cut too much perhaps when supervised (7)
I believe the answer is:
'supervised' is the definition.
('oversee' can be a synonym of 'supervise')
'cut too much perhaps' is the wordplay.
I cannot really see how this works, but
'cut' could be 'saw' (sawing is a kind of cutting) and 'saw' is located in the answer.
'too much' could be 'over' (I've seen this in other clues) and 'over' is present in the answer.
This accounts for all the letters.
This may be the basis of clue (or it may be nonsense).
'when' is the link.
Can you help me to learn more?
(Other definitions for oversaw that I've seen before include "Supervised", "watcher", "What supervisor did", "Managed".)