Crossword Genius

Hot shower steamy, ultimately (7)

Ross

I believe the answer is:

peppery

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

'hot' is the definition.
(synonyms)

'shower steamy ultimately' is the wordplay.
I cannot really understand how this works, but
'shower' could be 'pepper' (I've seen this before) and 'pepper' is present in the answer.
A single letter 'y' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for peppery that I've seen before include "Highly spiced" , "Irritable" , "Very spicy" , "Quick-tempered" .)

I've seen this clue in The Guardian.
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