Stocking filler for horny loners (5)

I believe the answer is:

nylon

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

'stocking' is the definition.
(nylon stocking is a kind of stocking)

'filler for horny loners' is the wordplay.
'NYLON' is hidden in amongst the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for nylon that I've seen before include "may be damaged by running" , "Synthetic cloth" , "Polyamide" , "Artificial yarn/fabric" , "Tights material" .)

I've seen this clue in The Independent.

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