Crossword Genius

A fitting end to a pipe (3)

Ross

I believe the answer is:

tap

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'pipe' is the definition.
(thesaurus)

I cannot understand how the remainder of the clue works.

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(Other definitions for tap that I've seen before include "Draw upon Pat" , "In America, it's a spigot" , "Make use of; water from it" , "Stopper enabling withdrawal of liquid" , "British faucet" .)

I've seen this clue in the Evening Standard.
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