Yarn assimilated by many Londoners (5)

I believe the answer is:

nylon

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'yarn' is the definition.
(thesaurus)

'assimilated by many londoners' is the wordplay.
'NYLON' is hidden in amongst the letters.
But, I'm not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for nylon that I've seen before include "Plastic used for stockings" , "Artific ial (stocking) material" , "Yarn for stockings" , "Synthetic cloth" , "Strong, resilient, synthetic fibre" .)

I've seen this clue in The Times.

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