Crossword Genius

Instruments we hear annoy ancient settlers (9)

Ross

I believe the answer is:

triangles

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'instruments' is the definition.
(triangle is a kind of instrument)

'we hear annoy ancient settlers' is the wordplay.
'we hear' indicates a 'sounds like' (homophone) clue.
'annoy' becomes 'try' (I've seen this in another clue).
'ancient settlers' becomes 'angles' (I can't explain this - if you can you should give a lot more credence to this answer).
'try' sounds like 'tri'.
'tri'+'angles'='TRIANGLES'

Can you help me to learn more?

(Other definitions for triangles that I've seen before include "Geometrical figures" , "Three-sided shapes" , "Three-sided figures" , "Musical instruments" , "Three-sided polygons" .)

I've seen this clue in The Telegraph.
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