Expert in steamy photo (7)

I believe the answer is:

hotshot

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'expert' is the definition.
(hotshot is a kind of expert)

'steamy photo' is the wordplay.
'steamy' becomes 'hot' (I can't explain this - if you can you should believe this answer much more).
'photo' becomes 'shot' (shot is a kind of photo).
'hot'+'shot'='HOTSHOT'

'in' acts as a link.

Can you help me to learn more?

(Other definitions for hotshot that I've seen before include "successful type?" , "Expert" , "Showily successful person" , "ace" , "Important person" .)

I've seen this clue in The Sun.

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