Crossword Genius

Mate’s reels sampled your old Deep Purple (8)

Ross

I believe the answer is:

amethyst

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

'purple' is the definition.
(thesaurus)

'mate's reels sampled your old deep' is the wordplay.
I cannot quite understand how this works, but
'your' could be 'thy' ('thy' historically meant 'your') and 'thy' is found within the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for amethyst that I've seen before include "February gemstone" , "Semiprecious stone of violet or purple quartz" , "Bluish-violet 3" , "Purplish gemstone" , "Violet-coloured stone" .)

I've seen this clue in the Sydney Morning Herald.
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