Buns (sandwiches, that is) (7)
I believe the answer is:
butties
'sandwiches that is' is the definition.
'butties' can be an answer for 'sandwiches' (butty can informally mean a sandwich). I'm not certain of the remainder of the definition.
'buns' is the wordplay.
I cannot really see how this works, but
'buns' could be 'butt' (synonyms) and 'butt' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
I've seen this clue in The Independent.
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