Crossword Genius

Convenient place to hang the bath plug (2,3)

Ross

I believe the answer is:

on tap

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'convenient' is the definition.
(thesaurus)

I cannot understand how the rest of the clue works.

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(Other definitions for on tap that I've seen before include "Always available" , "Where to find a washer" , "readily accessible" , "Ready to be drawn off, like beer" , "where C or H is seen?" .)

I've seen this clue in The Globe and Mail.
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