Crossword Genius

Cultivate grand argument (4)

Ross

I believe the answer is:

grow

'cultivate' is the definition.
(growing is a kind of cultivating)

'grand argument' is the wordplay.
'grand' becomes 'g' (synonyms).
'argument' becomes 'row' (I've seen this before).
'g'+'row'='GROW'

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

I've seen this clue in The Times.
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