Warning chief to dine (5,2)

I believe the answer is:

heads up

'warning' is the definition.
(I know that heads-up is a type of warning)

'chief to dine' is the wordplay.
'chief' becomes 'head' (synonyms).
'to dine' becomes 'sup' (synonyms).
'head'+'sup'='HEADS-UP'

(Other definitions for heads up that I've seen before include "Warning of impending event" , "Word to the wise" , "Alert" .)

I've seen this clue in The Daily Express.

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