Biscuits made by nuns, largely trigger happy (6,4)
I believe the answer is:
'biscuits' is the definition.
(I've seen this before)
'nuns largely trigger happy' is the wordplay.
'largely' means to remove the last letter.
'happy' indicates an anagram (happy can mean slightly drunk).
'trigger' with its last letter taken off is 'trigge'.
'nunstrigge' with letters rearranged gives 'GINGER NUTS'.
'made by' is the link.
(Another definition for ginger nuts that I've seen is " biscuits".)