Spin round to disorientate canoeist (7)
I believe the answer is:
paddler
'canoeist' is the definition.
(synonyms)
'spin round to disorientate' is the wordplay.
'spin' becomes 'PR' (short for public relations - media spin).
'round' means one lot of letters goes inside another.
'to disorientate' becomes 'addle' (I can't explain this - if you can you should give a lot more credence to this answer).
'pr' placed around 'addle' is 'PADDLER'.
Can you help me to learn more?
(Other definitions for paddler that I've seen before include "Wader" , "Swimmer, perhaps" , "Walker in shallow water" .)