Crossword Genius

Starts unveiling some prototypes, specifying distinctive product features (4)

Ross

I believe the answer is:

usps

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'distinctive product features' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'starts unveiling some prototypes specifying' is the wordplay.
'starts' says to take the initial letters.
The initial letters of 'unveiling some prototypes specifying' is 'USPS'.

Can you help me to learn more?

(Another definition for usps that I've seen is " reasons for choosing product".)

I've seen this clue in The Irish Times.
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