Advancement of professional movement (9)
I believe the answer is:
promotion
'advancement' is the definition.
(synonyms)
'professional movement' is the wordplay.
'professional' becomes 'pro' (synonyms).
'movement' becomes 'motion' (synonyms).
'pro'+'motion'='PROMOTION'
'of' is the link.
(Other definitions for promotion that I've seen before include "sales campaign" , "Puffing, perhaps" , "Publicity campaign" , "Step up" , "Advancement" .)