Crossword Genius

The old school head is in agreement (3)

Ross

I believe the answer is:

yes

'agreement' is the definition.
(I've seen this in another clue)

'the old school head' is the wordplay.
'the old' becomes 'ye' (resembles a historical spelling of 'the').
'head' indicates taking the first letters.
The first letter of 'school' is 's'.
'ye'+'s'='YES'

'is in' acts as a link.

(Other definitions for yes that I've seen before include "Absolutely" , "Validating vote" , "Pro vote" , "Affirmative answer" , "Word of affirmation" .)

I've seen this clue in the Evening Standard.
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