Can a gram make a difference to Brandy? (8)

I believe the answer is:

armagnac

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'to brandy?' is the definition.
(Armagnac is an example)

'can a gram make' is the wordplay.
'make' indicates an anagram.
'can'+'a'+'gram'='canagram'
'canagram' anagrammed gives 'ARMAGNAC'.

'a difference' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for armagnac that I've seen before include "Spirit" , "Dry brandy from south-west France" , "Liquor" , "stronger drink than ale" , "Brandy traditionally made in Aquitaine" .)

I've seen this clue in The Hindu.

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