We tucked into small serving of food like köttbullar? (7)
I believe the answer is:
swedish
'food like kottbullar?' is the definition.
I can't tell whether this definition defines the answer.
'we tucked into small serving' is the wordplay.
'tucked into' means one lot of letters goes inside another.
'small' becomes 's' (abbreviation - e.g. clothes size).
'serving' becomes 'dish' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
's'+'dish'='sdish'
'we' put within 'sdish' is 'SWEDISH'.
'of' is the link.
Can you help me to learn more?
(Other definitions for swedish that I've seen before include "Nationality that swished around" , "A Scandinavian language" , "He saw Miss Degas (anag) -- Scandinavian body work" , "From Uppsala, perhaps" , "Soprano Jenny Lind, b. Stockholm 1798, d. Herefordshire 1887" .)