School uniform switched to vulgar stuff (6)
I believe the answer is:
kitsch
'stuff' is the definition.
(I have seen 'Tawdry stuff ' mean 'kitsch' so perhaps 'stuff' could also mean 'kitsch')
'school uniform switched to vulgar' is the wordplay.
I cannot really understand how this works, but
'school' could be 'sch' (abbreviation) and 'sch' is found within the answer.
The remaining letters 'kit' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for kitsch that I've seen before include "Garish tasteless art" , "Trashy, vulgar" , "Vulgarly pretentious art" , "Vulgar, pretentious" , "Vulgarised art" .)