Leave to watch occasional worker (4,5)

I believe the answer is:

part timer

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'occasional worker' is the definition.
'part-timer' can be an answer for 'worker' (part-timer is a kind of worker). I am not sure about the 'occasional' bit.

'leave to watch' is the wordplay.
'leave' becomes 'part' (parting means leaving or separating).
'to watch' becomes 'timer' (I've seen this before).
'part'+'timer'='PART-TIMER'

Can you help me to learn more?

(Other definitions for part timer that I've seen before include "only works occasionally" , "one with fewer hours" , "One sometimes employed" .)

I've seen this clue in The Daily Express.

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