Spoilt brat ain't educated? Not entirely (7)

I believe the answer is:

tainted

'spoilt' is the definition.
(tainting is a kind of spoiling)

'brat ain't educated? not entirely' is the wordplay.
'not entirely' says the answer is hidden in the clue.
'TAINTED' is hidden within 'brat aint educated'.

(Other definitions for tainted that I've seen before include "Contaminated, polluted" , "Flawed, contaminated" , "Adulterated" , "corrupt" , "Spoiled, stained" .)

I've seen this clue in The Telegraph.

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