Grant Mike dubious promotion (9)
I believe the answer is:
marketing
'promotion' is the definition.
(I've seen this before)
'grant mike dubious' is the wordplay.
'dubious' is an anagram indicator.
'grant'+'mike'='grantmike'
'grantmike' anagrammed gives 'MARKETING'.
(Other definitions for marketing that I've seen before include "Promoting and selling (goods or services)" , "Product promotion" , "Commercial process" .)