Top walls in gold showing deviation (6)
I believe the answer is:
borrow
'deviation' is the definition.
The definition and answer are not the same part of speech.
'top walls in gold' is the wordplay.
'top' becomes 'brow' (brow can mean a summit or peak).
'walls in' is an insertion indicator (I've seen this in other clues).
'gold' becomes 'or' ('or' is the heraldic name for gold).
'brow' going around 'or' is 'BORROW'.
'showing' is the link.
Can you help me to learn more?
(Other definitions for borrow that I've seen before include "Accept a loan" , "Receive as a loan" , "Take, use and return" , "In library, ask for" , "Take with (or without!) permission" .)