Crossword Genius

Adult feature contains bondage equipment? (5)

Ross

I believe the answer is:

chain

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

'bondage equipment?' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I don't see?

'adult feature contains' is the wordplay.
'adult' becomes 'a' (abbreviation).
'feature' becomes 'chin' (facial feature).
'contains' means one lot of letters goes inside another.
'a' put within 'chin' is 'CHAIN'.

Can you help me to learn more?

(Other definitions for chain that I've seen before include "Rope of metal links" , "Series of connected things" , "Line of links" , "Handcuff" , "a sort of letter" .)

I've seen this clue in The Independent.
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