Promotion? No - leave it out! (9)
I believe the answer is:
elevation
'promotion?' is the definition.
(thesaurus)
'no leave it out' is the wordplay.
'out' indicates an anagram (out can mean wrong or inaccurate).
'no'+'leave'+'it'='noleaveit'
'noleaveit' with letters rearranged gives 'ELEVATION'.
(Other definitions for elevation that I've seen before include "Diagram" , "Drawing of the external face of a building" , "high ground" , "Height - a live note (anag)" , "Height above a given level" .)