Crossword Genius

Range with original parts from Essex supplier (5)

Ross

I believe the answer is:

andes

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'range' is the definition.
(South American mountain range)

'with original parts from essex supplier' is the wordplay.
I cannot quite understand how this works, but
'with' could be 'and' and 'and' is located in the answer.
'from' could be 'e' (I've seen this in other clues) and 'e' is found in the answer.
A single letter 's' remains which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for andes that I've seen before include "The range of llamas?" , "South American mountains" , "Mountains in west" , "danes found in mountains" , "Major mountain range" .)

I've seen this clue in The Times and The Sunday Times.
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