Assessing some brat in group (6)

I believe the answer is:

rating

'assessing' is the definition.
(rating is a kind of assessing)

'some brat in group' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'RATING' can be found hidden inside 'brat in group'.

(Other definitions for rating that I've seen before include "Angry reprimand for non-commissioned sailor?" , "Lowly naval rank" , "Grade or assessment" , "Grading; sailor" , "Doing an appraisal" .)

I've seen this clue in The Telegraph.

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