Showing cheek perhaps accepting easy extra work (12)

I believe the answer is:

moonlighting

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'extra work' is the definition.

'showing cheek perhaps accepting easy' is the wordplay.
'showing cheek perhaps' becomes 'mooning' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'accepting' indicates putting letters inside (inserted letters are accepted).
'easy' becomes 'light' (similar in meaning).
'mooning' going around 'light' is 'MOONLIGHTING'.

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(Another definition for moonlighting that I've seen is " Having a second job".)

I've seen this clue in The Times.

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