Crossword Genius

Establishment obviously needing a way to heat water (8)

Ross

I believe the answer is:

teahouse

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

'establishment obviously needing a way' is the definition.
I can't tell whether this defines the answer.

'heat water' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'heat' is 'teah' which is present in the answer.
The remaining letters 'ouse' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).

'to' acts as a link.

Can you help me to learn more?

(Other definitions for teahouse that I've seen before include "''The ... of the August Moon'' (film with Marlon Brando)" , "Japanese cafe" , "restaurant in China" , "refreshments served here" , "Chinese restaurant" .)

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