Wrong ten grades — not close (9)

I believe the answer is:

estranged

'not close' is the definition.

'wrong ten grades' is the wordplay.
'wrong' indicates an anagram.
'ten'+'grades'='tengrades'
'tengrades' is an anagram of 'ESTRANGED'.

(Other definitions for estranged that I've seen before include "Cut off" , "A nerd gets (anag) - separated" , "no longer friendly" , "Having become unfriendly or alienated" , "Sad regent (anag) - disaffected" .)

I've seen this clue in The Times.

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