Gather small number for big blaze (7)

I believe the answer is:

inferno

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'big blaze' is the definition.
'inferno' can be an answer for 'blaze' (I've seen this before). I'm unsure of the 'big' bit.

'gather small number' is the wordplay.
'gather' becomes 'infer' (synonyms).
'small number' becomes 'no' (abbreviation; 'small' asks for an abbreviation).
'infer'+'no'='INFERNO'

'for' acts as a link.

Can you help me to learn more?

(Other definitions for inferno that I've seen before include "Fierce fire" , "A raging fire as in hell - ask Dante" , "Hell - conflagration" , "Huge fire" , "Hellish poem" .)

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