Crossword Genius

Argue about a family member (6)

Ross

I believe the answer is:

reason

'argue' is the definition.
(synonyms)

'about a family member' is the wordplay.
'about' becomes 'rea' (I've seen this in other clues).
'a family member' becomes 'son' (I've seen this in another clue).
'rea'+'son'='REASON'

(Other definitions for reason that I've seen before include "Motive for an action" , "Incentive" , "Justification or motive" , "'Motivation, grounds (6)'" , "Sanity and logic" .)

I've seen this clue in The Guardian.
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