Joint, symbol of peace Catlin endlessly passed around (8)
I believe the answer is:
dovetail
'joint' is the definition.
(I've seen this before)
'symbol of peace catlin endlessly passed around' is the wordplay.
I cannot quite see how this works, but
'symbol' could be 'dove' (dove is a kind of symbol) and 'dove' is found within the answer.
The remaining letters 'tail' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for dovetail that I've seen before include "Come together" , "Wood joint" , "Violated (anag) -- mortise joint" , "Woodworking joint" , "Joint with fan-shaped tenon" .)