Ridiculous bards drunk round university (6)
I believe the answer is:
absurd
'ridiculous' is the definition.
(synonyms)
'bards drunk round university' is the wordplay.
'drunk' indicates an anagram.
'round' means one lot of letters goes inside another.
'university' becomes 'u' (abbreviation for university).
'bards' anagrammed gives 'absrd'.
'absrd' enclosing 'u' is 'ABSURD'.
(Other definitions for absurd that I've seen before include "Quite ridiculous, silly" , "Quite ridiculous, laughable" , "Foolish, quite ridiculous" , "irrational" , "'Derisory, cockeyed (6)'" .)