Fussy eater disturbing novices’ rite (11)
I believe the answer is:
insectivore
'fussy eater' is the definition.
(insectivores have a specific or fussy diet)
'disturbing novices' rite' is the wordplay.
'disturbing' indicates an anagram (I've seen this in other clues).
'novices'+'rite'='novicesrite'
'novicesrite' anagrammed gives 'INSECTIVORE'.
(Other definitions for insectivore that I've seen before include "Cricket fan perhaps" , "Animal such as an anteater" , "creature like a mole" , "Creature such as hedgehog or shrew" , "Animal such as a hedgehog or shrew" .)