Church on island visited by a very loud bird (9)
I believe the answer is:
chaffinch
'bird' is the definition.
(chaffinch is a kind of bird)
'church on island visited by a very loud' is the wordplay.
'church on' becomes 'ch' (common abbreviation. I am not sure about the 'on' bit.**).
'island' becomes 'inch' (I've seen this before).
'visited by' is an insertion indicator.
'very loud' becomes 'ff' (musical abbreviation).
'ch'+'inch'='chinch'
'a'+'ff'='aff'
'chinch' enclosing 'aff' is 'CHAFFINCH'.
Can you help me to learn more?
(Other definitions for chaffinch that I've seen before include "Singer" , "Common bird" , "European bird with black and white wings" , "Garden bird" , "Small European songbird" .)