Instrument designed to annoy the French (5)
I believe the answer is:
bugle
'instrument' is the definition.
(I know that bugle is a type of lip-reed)
'annoy the french' is the wordplay.
'annoy' becomes 'bug' (I've seen this in another clue).
'the french' becomes 'le' ('the' in French).
'bug'+'le'='BUGLE'
'designed to' acts as a link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for bugle that I've seen before include "An army trumpet" , "Brass instrument; plant" , "Instrument used for military signals" , "Military musical instrument" , "Does it call" .)