University dons fabricated claims about output from instruments? (7)
I believe the answer is:
musical
'about output from instruments?' is the definition.
(relating to music, as in musical instruments)
'university dons fabricated claims' is the wordplay.
'university' becomes 'u'.
'dons' is an insertion indicator (don means to wear or put on).
'fabricated' indicates an anagram.
'claims' is an anagram of 'msical'.
'u' put into 'msical' is 'MUSICAL'.
(Other definitions for musical that I've seen before include "Melodious" , "Euphonious" , "Form of theatre" , "Type of stage show" , "Drama where songs are more important than plot" .)