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Water music apt for this routine? (3,5)

Ross

I believe the answer is:

tap dance

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'apt for this routine?' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'water music' is the wordplay.
'water' becomes 'tap water' (tap water is a kind of water).
'music' becomes 'dance' (dance music is a kind of music).
'tap'+'dance'='TAP-DANCE'

Can you help me to learn more?

(Other definitions for tap dance that I've seen before include "Move rhythmically (for joy?) wearing special shoes" , "Steel-toecapped entertainment" , "moving performance" , "Entertainment needing special shoes" , "Noisy entertainment" .)

I've seen this clue in The Sun.
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