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Dishy school principal, an impetuous person (7)

Ross

I believe the answer is:

hothead

'an impetuous person' is the definition.
(I've seen this before)

'dishy school principal' is the wordplay.
'dishy' becomes 'hot' (dishy can mean attractive).
'school principal' becomes 'head' (synonyms).
'hot'+'head'='HOTHEAD'

(Other definitions for hothead that I've seen before include "Person liable to get reckless impulses" , "Daredevil" , "Quick-tempered person" , "Headstrong type" , "Fiery character" .)

I've seen this clue in The Times.
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