Don't leave graduate in control (6)
I believe the answer is:
remain
'don't leave' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe you can see an association between them that I don't see?
'graduate in control' is the wordplay.
'graduate' becomes 'MA' (abbreviation for Master of Arts).
'in' means one lot of letters goes inside another.
'control' becomes 'rein' (rein is a kind of control).
'ma' going into 'rein' is 'REMAIN'.
Can you help me to learn more?
(Other definitions for remain that I've seen before include "Don't leave (the EU?)" , "Stay on when others have left" , "Continue in position" , "Stay on after others have gone" , "Stay (in a place)" .)