Fight hard for work balance (5)

I believe the answer is:

wrest

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'fight hard for work balance' is the definition.
I can't tell whether this definition defines the answer.

'work balance' is the wordplay.
'work' becomes 'w' (physics abbreviation).
'balance' becomes 'rest' (I've seen this before).
'w'+'rest'='WREST'

Can you help me to learn more?

(Other definitions for wrest that I've seen before include "Take away forcibly" , "The old piano tuner" , "Grab" , "Seize (control)" , "Remove with force" .)

I've seen this clue in the Sydney Morning Herald.

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