Crossword Genius

Parent upset about measure that can be offputting (9)

Ross

I believe the answer is:

repellant

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'parent upset about measure that can be offputting' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

'parent upset about measure' is the wordplay.
'upset' indicates an anagram.
'about' indicates putting letters inside.
'measure' becomes 'ell' (historical unit of length).
'parent' is an anagram of 'repant'.
'repant' placed around 'ell' is 'REPELLANT'.

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I've seen this clue in The Guardian.
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