To put the motion, you'll need a professional attitude (7)
I believe the answer is:
propose
'to put' is the definition.
(thesaurus)
'professional attitude' is the wordplay.
'professional' becomes 'pro' (abbreviation).
'attitude' becomes 'pose' (attitude can mean a pose or stance).
'pro'+'pose'='PROPOSE'
'the motion you'll need a' acts as a link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for propose that I've seen before include "Pop the question" , "Put forward a plan" , "Request" , "Intend" , "Tender" .)