Crossword Genius

A possibility of promotion and accommodation in the penthouse (4,2,3,3)

Ross

I believe the answer is:

room at the top

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

'penthouse' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'a possibility of promotion and accommodation in the' is the wordplay.
I cannot quite understand how this works, but
'a' is present in the answer.
'possibility' could be 'room' (room is a kind of possibility) and 'room' is located in the answer.
'of' could be 'o' and 'o' is found within the answer.
an anagram of 'the' is 'het' which is within the answer.
This may be the basis of clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for room at the top that I've seen before include "film" , "Seats still available in upper circle" , "accommodation with extensive view?" , "opportunity to lead an organisation?" , "John Braine novel (about an attic?)" .)

I've seen this clue in the Evening Standard.
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