Shoves the tom cat outside (6)
I believe the answer is:
pushes
'shoves' is the definition.
(I've seen this before)
'tom cat outside' is the wordplay.
'tom' becomes 'he' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'cat' becomes 'puss' (puss is a kind of cat).
'outside' indicates putting letters inside (some letters go outside others).
'he' put into 'puss' is 'PUSHES'.
'the' is the link.
Can you help me to learn more?
(Other definitions for pushes that I've seen before include "Presses, drives, or impels to action" , "Propels" , "Presses to move" , "Shoves" .)