Mad for unsweetened biscuits (8)

I believe the answer is:

crackers

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This clue could be a double definition.

'mad' is the first definition.
(thesaurus)

'unsweetened biscuits' is the second definition.
'crackers' can be an answer for 'biscuits' (I've seen this before). I'm not certain of the 'unsweetened' bit.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for crackers that I've seen before include "nuts and > bananas" , "they may be on the table at Christmas" , "Christmas items" , "Mad - biscuits" , "one may find them on the table tomorrow" .)

I've seen this clue in The Irish Independent.

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