Crossword Genius

Thatcher may have used these instruments (5)

Ross

I believe the answer is:

reeds

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'these instruments' is the definition.
(reed 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 reeds that I've seen before include "River grasses" , "Music-makers" , "Marsh plants with tall straight stems" , "Thatching stalks" , "Tall grasses with hollow stems" .)

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