Excessively large number (5)

I believe the answer is:

gross

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This clue might be a double definition.

'excessively large' is the first definition.
'gross' can be an answer for 'large' (similar in meaning). I am not certain of the 'excessively' bit.

'number' is the second definition.
(gross is a kind of number)

Can you help me to learn more?

(Other definitions for gross that I've seen before include "result of a 12 x 12 construction" , "square?" , "Make altogether" , "Flagrant - unpleasant - 144" , "clearly wrong" .)

I've seen this clue in The Globe and Mail.

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