Crossword Genius

Stale ingredient of school dinners (3)

Ross

I believe the answer is:

old

'stale' is the definition.
('old' can be a synonym of 'stale')

'ingredient of school dinners' is the wordplay.
'ingredient of' indicates a hidden word.
'OLD' is hidden within 'school dinners'.

(Other definitions for old that I've seen before include "Senescent" , "Former, previous" , "Long in the tooth" , "out of the ark" , "Wild clematis" .)

I've seen this clue in the Evening Standard.
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