Where one might study e.g. Watt or Kelvin briefly (3)
I believe the answer is:
uni
'where one might study e g watt or kelvin briefly' is the definition.
The definition suggests a singular noun which matches the answer.
'where one' is the wordplay.
I cannot quite understand how this works, but
'one' could be 'un' (northern English dialect form of 'one') and 'un' is found in the answer.
A single letter 'i' remains which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for uni that I've seen before include "Queen's, Belfast, for example" , "educational establishment" , "Place of higher education (abbr)" , "University (abbreviation)" , "Short for university" .)