New university attracting silly nudes (6)
I believe the answer is:
unused
'new' is the definition.
(similar in meaning)
'university attracting silly nudes' is the wordplay.
'university' becomes 'U' (abbreviation for university).
'attracting' means one lot of letters go next to another.
'silly' indicates an anagram.
'nudes' anagrammed gives 'nused'.
'u'+'nused'='UNUSED'
(Other definitions for unused that I've seen before include "Neither employed nor second-hand" , "Mint, as new" , "Not accustomed to" , "'Fresh, new (6)'" , "idle" .)