Two girls regularly finding work (4)

I believe the answer is:

toil

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'work' is the definition.
(I know that toil is a type of work)

I can't explain the rest of the clue.

(Other definitions for toil that I've seen before include "Work extremely hard" , "Work incessantly" , "Work really hard" , "Manual labour" , "Drudgery" .)

I've seen this clue in The Times and The Sun.

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