By brat I set to work! (4-6)

I believe the answer is:

baby-sitter

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'by brat i set to work' is the definition.
I can't judge whether this definition defines the answer.

'by brat i set to work' is the wordplay.
'to work' indicates anagramming the letters (letters worked into a new order).
'by'+'brat'+'i'+'set'='bybratiset'
'bybratiset' with letters rearranged gives 'BABY-SITTER'.

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I've seen this clue in The Everyman puzzle in The Observer.

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