Crossword Genius

Restrict set in order to be heard (8)

Ross

I believe the answer is:

straiten

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

'restrict' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for straiten that I've seen before include "Restrict" , "Limit" , "Train set (anag.)" , "distress" .)

I've seen this clue in The Sunday Times.
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