Crossword Genius

One of two wind instruments isn't keeping time. It's exhausting! (4,4)

Ross

I believe the answer is:

flue pipe

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

'one of two wind' is the definition.
'flue pipe' can be an answer for 'wind' (flue pipe is a kind of wind). I'm unsure of the 'one of two' bit.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for flue pipe that I've seen is " Organ part".)

Want a hint initially instead of a full solution? Install my app