Leave on foot, not to go to work (4,3)
I believe the answer is:
walk out
'leave' is the definition.
(walking out is a kind of leaving)
'foot not to go to work' is the wordplay.
'foot' becomes 'walk' (synonyms).
'not' becomes 'o' (I've seen this in other clues).
'to go to work' becomes 'ut' (I can't justify this - if you can you should give a lot more credence to this answer).
'walk'+'o'+'ut'='WALK-OUT'
'on' is the link.
Can you help me to learn more?
(Other definitions for walk out that I've seen before include "Leave in anger - go on strike" , "leave angrily" , "Stroll to court" .)