Crossword Genius

Thoughtless regarding young woman (6)

Ross

I believe the answer is:

remiss

'thoughtless' is the definition.
(thesaurus)

'regarding young woman' is the wordplay.
'regarding' becomes 're' ('re' means regarding or about).
'young woman' becomes 'miss' (title for a young woman).
're'+'miss'='REMISS'

(Other definitions for remiss that I've seen before include "Negligent in performance of duty" , "Negligent, slack" , "Lacking attention to duty" , "Negligent like misers" , "Failing in what duty requires" .)

I've seen this clue in The Telegraph.
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