Crossword Genius

A harsh-sounding regimen (6)

Ross

I believe the answer is:

course

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'regimen' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.

'a harsh-sounding' is the wordplay.
'a harsh' becomes 'coarse' (I've seen this in another clue).
'sounding' shows a homophone (sound like).
'coarse' sounds like 'COURSE'.

Can you help me to learn more?

(Other definitions for course that I've seen before include "Route along which something travels" , "Mode, of action say" , "way" , "Part of a meal (par for this?)" , "Curriculum" .)

I've seen this clue in the Evening Standard.
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