Teacher redesigned unit (7)

I believe the answer is:

hectare

'unit' is the definition.
(I know that hectare is a type of area unit)

'teacher redesigned' is the wordplay.
'redesigned' indicates an anagram.
'teacher' is an anagram of 'HECTARE'.

(Other definitions for hectare that I've seen before include "The race (anag) - unit of area" , "Some land in France" , "Ten thousand square metres" , "Metric unit of area" , "10,000 square metres" .)

I've seen this clue in The Everyman puzzle in The Observer.

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