Crossword Genius

Develop grand argument (4)

Ross

I believe the answer is:

grow

'develop' is the definition.
(growing is a kind of developing)

'grand argument' is the wordplay.
'grand' becomes 'g' ('G' can be a synonym of 'grand').
'argument' becomes 'row' (I've seen this before).
'g'+'row'='GROW'

(Other definitions for grow that I've seen before include "Get bigger" , "Expand" , "Become bigger" , "Burgeon" , "Wax" .)

I've seen this clue in The Guardian.
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