Crossword Genius

Child attending comprehensive gets good mark for addition (9)

Ross

I believe the answer is:

totalling

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

'child attending comprehensive gets good' is the wordplay.
'child' becomes 'tot' (I've seen this before).
'attending' is a charade indicator (letters next to each other).
'comprehensive' becomes 'allin' (I've seen this before).
'gets' is a charade indicator (letters next to each other).
'good' becomes 'g' (abbreviation).
'tot'+'allin'+'g'='TOTALLING'

'mark for' is the link.

(Other definitions for totalling that I've seen before include "Coming to" , "Summing to" , "Addition" .)

I've seen this clue in The Guardian.
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