Crossword Genius

Reserve hotel, needing flower in cool environment (8)

Ross

I believe the answer is:

icehouse

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

'cool environment' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'reserve hotel needing flower' is the wordplay.
'reserve' becomes 'ice ' (both can mean aloofness).
'hotel' becomes 'h' (phonetic alphabet).
'needing' says to put letters next to each other.
'flower' becomes 'ouse' (Yorkshire river).
'ice'+'h'+'ouse'='ICEHOUSE'

'in' acts as a link.

Can you help me to learn more?

(Another definition for icehouse that I've seen is " Cold store".)

I've seen this clue in The Times.
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