Let audit be carried out at height (8)
I believe the answer is:
altitude
'height' is the definition.
(synonyms)
'let audit be carried out' is the wordplay.
'be carried out' indicates an anagram (letters carried to different places).
'let'+'audit'='letaudit'
'letaudit' is an anagram of 'ALTITUDE'.
'at' acts as a link.
(Other definitions for altitude that I've seen before include "high place" , "Elevation above sea level" , "Lofty position" , "Height above the earth's surface" , "Angular distance above the horizon" .)