Guard's raised before son makes another sketch (7)

I believe the answer is:

redraws

'makes another sketch' is the definition.

'guard's raised before son' is the wordplay.
'guard' becomes 'warder'.
'raised' is a reversal indicator.
'before' is a charade indicator (letters next to each other).
'son' becomes 's'.
'warder' back-to-front is 'redraw'.
'redraw'+'s'='REDRAWS'

I've seen this clue in The Telegraph.

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