Invalid filled in forms when touring university (9)
I believe the answer is:
nullified
'invalid' is the definition.
(similar in meaning)
'filled in forms when touring university' is the wordplay.
'forms' indicates an anagram.
'when touring' is an insertion indicator.
'university' becomes 'U' (abbreviation as in UMass).
'filled'+'in'='filledin'
'filledin' anagrammed gives 'nllified'.
'nllified' enclosing 'u' is 'NULLIFIED'.
(Other definitions for nullified that I've seen before include "revoked" , "Made invalid" , "Scrubbed" , "Cancelled out" , "Abrogated" .)