Crossword Genius

A hot number at altitude (6)

Ross

I believe the answer is:

height

'altitude' is the definition.
(synonyms)

'a hot number' is the wordplay.
'a hot' becomes 'h' (abbreviation, eg on taps).
'number' becomes 'eight' (eight is a kind of number).
'h'+'eight'='HEIGHT'

'at' is the link.

(Other definitions for height that I've seen before include "Measure it from top to bottom" , "Rising ground; extreme example" , "Distance above ground or sea" , "Stature" , "size up?" .)

I've seen this clue in the Evening Standard.
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