High level promotion (7)
I believe the answer is:
upgrade
'promotion' is the definition.
(I've seen this before)
'high level' is the wordplay.
'high' becomes 'up' (associated in meaning).
'level' becomes 'grade' (synonyms).
'up'+'grade'='UPGRADE'
(Other definitions for upgrade that I've seen before include "Improve equipment or promote" , "Raise in status or quality" , "Drug ape to improve" , "Improve, enhance" , "Improvement" .)