Crossword Genius

Careless and extremely restive girl (6)

Ross

I believe the answer is:

remiss

'careless' is the definition.
(I've seen this before)

'extremely restive girl' is the wordplay.
'extremely' suggests removing the centre.
'girl' becomes 'miss' (synonyms).
'restive' with its centre taken out is 're'.
're'+'miss'='REMISS'

'and' is the link.

(Other definitions for remiss that I've seen before include "Not taking care" , "Negligent, lax" , "Wrong" , "At fault" , "Careless concerning a girl?" .)

I've seen this clue in The Hindu.
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