Tailor's initial trick, we hear, making trousers (5)

I believe the answer is:

trews

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'trousers' is the definition.
(trews is a kind of trousers)

I cannot understand how the remainder of the clue works.

(Other definitions for trews that I've seen before include "Garment" , "Wrest (anag) - trousers" , "Some clothes" , "Trousers of a Scot" , "nether garments" .)

I've seen this clue in The Telegraph.

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