Crossword Genius

Instrument sounds unbelievable (4)

Ross

I believe the answer is:

lyre

I'm a little stuck... Click here to teach me more about this clue!

'instrument' is the definition.
(lyre is a kind of instrument)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for lyre that I've seen before include "Early harp" , "Music-maker" , "Plucked instrument" , "Ancient Greek harp" , "Harp used by ancient Greeks" .)

I've seen this clue in The Globe and Mail.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.