Top manager removing four (7)
I believe the answer is:
execute
'top' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how one could define the other.
'manager removing four' is the wordplay.
'manager' becomes 'exec' (I've seen this before).
'removing four' becomes 'ute' (I can't justify this - if you can you should give a lot more credence to this answer).
'exec'+'ute'='EXECUTE'
Can you help me to learn more?
(Other definitions for execute that I've seen before include "Maybe send to chair" , "Carry output to death" , "ice" , "Carry out or kill legally" , "Finish off" .)