Rotating component plumber's fitting under the sink (4)

I believe the answer is:

trap

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'plumber's fitting under the sink' is the definition.
I can't tell whether this defines the answer.

'rotating component' is the wordplay.
'rotating' says the letters should be written in reverse.
'component' becomes 'part' (a component is a part of something).
'part' in reverse letter order is 'TRAP'.

Can you help me to learn more?

(Other definitions for trap that I've seen before include "The Web" , "Deceive" , "Light carriage; ensnare" , "Snare, ruse" , "Snaring device" .)

I've seen this clue in The Independent.

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