Although small, couple accepted sandwiches … (7)

'sandwiches' is the definition.
(butty can informally mean a sandwich)

'although small couple accepted' is the wordplay.
'although' becomes 'but' (I've seen this in other clues).
'small' becomes 's' (abbreviation - e.g. clothes size).
'couple' becomes 'tie' (I've seen this in another clue).
'accepted' means one lot of letters goes inside another.
'but'+'s'='buts'
'buts' enclosing 'tie' is 'BUTTIES'.