At most, the ceiling (7)

I believe the answer is:

maximum

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This clue could be a double definition.

'at most' is the first definition.
'maximum' can be an answer for 'most' (thesaurus). I am unsure of the 'at' bit.

'ceiling' is the second definition.
(thesaurus)

'the' is the link.

Can you help me to learn more?

(Other definitions for maximum that I've seen before include "Highest amount" , "Utmost" , "The largest possible quantity or degree" , "Greatest possible quantity" , "Upper limit" .)

I've seen this clue in the Evening Standard.

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