Two climbing ungulates carrying gold instrument (4,5)
I believe the answer is:
reed organ
'instrument' is the definition.
(I know that reed organ is a type of instrument)
'two climbing ungulates carrying gold' is the wordplay.
I cannot really understand how this works, but
'gold' could be 'or' ('or' is the heraldic name for gold) and 'or' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for reed organ that I've seen before include "supports traditional services" , "musical instrument" , "Melody Maker?" , "Keyboard instrument, harmonium" , "small instrument" .)