A pole to catch a perch? (3)
I believe the answer is:
rod
'a perch?' is the definition.
('rod' can be a synonym of 'perch')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rod that I've seen before include "Bar, shaft" , "Stick, symbol of punishment" , "The fly fisherman's stick" , "Angler's pole" , "Cane - shaft" .)