Song in a code to do with buzzers (8)
I believe the answer is:
apiarian
'do with buzzers' is the definition.
I can't judge whether this definition defines the answer.
'song in a code' is the wordplay.
'song' becomes 'aria' (piece of music in an opera).
'in' is an insertion indicator.
'code' becomes 'pin' (a PIN number is a 4-digit code).
'a'+'pin'='apin'
'aria' placed inside 'apin' is 'APIARIAN'.
'to' is the link.
Can you help me to learn more?
(Other definitions for apiarian that I've seen before include "in a place that has a buzz?" , "Of bees" .)