A row about tucking into jam in school (13)
I believe the answer is:
conservatoire
'school' is the definition.
(I know that conservatoire is a type of school)
'a row about tucking into jam' is the wordplay.
'a row about' becomes 'atoir' (I can't explain this - if you can you should give a lot more credence to this answer).
'tucking into' means one lot of letters goes inside another.
'jam' becomes 'conserve' (I've seen this before).
'atoir' placed inside 'conserve' is 'CONSERVATOIRE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for conservatoire that I've seen before include "Music college" , "College of arts" , "School of music" , "School of note" .)