Handy guide teaches the cooks (5,5)

I believe the answer is:

cheat sheet

'handy guide' is the definition.
(guide that helps someone cheat)

'teaches the cooks' is the wordplay.
'cooks' is an anagram indicator.
'teaches'+'the'='teachesthe'
'teachesthe' with letters rearranged gives 'CHEAT SHEET'.

I've seen this clue in The Times.

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