Super amount of cash (5)

I believe the answer is:

grand

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'super' is the definition.
(thesaurus)

'amount of cash' is the wordplay.
'amount' becomes 'G' (G is an example).
'of cash' becomes 'rand' (I can't justify this - if you can you should give a lot more credence to this answer).
'g'+'rand'='GRAND'

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(Other definitions for grand that I've seen before include "1000, colloquially" , "Stately - splendid" , "A slangy PS1,000" , "PS1k" , "Fine" .)

I've seen this clue in The Times.

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