Extreme art put up on university link (5)
I believe the answer is:
ultra
'extreme' is the definition.
(I've seen this before)
'art put up on university link' is the wordplay.
'put up' is a reversal indicator.
'on' means one lot of letters go next to another.
'university link' becomes 'ul' (this might be a standard abbreviation which I don't know about).
'art' reversed gives 'tra'.
'tra' after 'ul' is 'ULTRA'.
Can you help me to learn more?
(Other definitions for ultra that I've seen before include "Prefix meaning extreme or excessive" , "Political extremist" , "extraordinary" , "Over the top" , "Extreme - extremist" .)