Crossword Genius

Beats unusual myth penned by gardeners (7)

Ross

I believe the answer is:

rhythms

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

'beats' is the definition.
(I know this)

'unusual myth penned by gardeners' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'myth' is 'ythm' which is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for rhythms that I've seen before include "Beats, cadences" , "Musical beats" .)

I've seen this clue in The Telegraph.
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