Movement, it happens in coat design (6)
I believe the answer is:
action
'movement' is the definition.
(I've seen this in another clue)
'in coat design' is the wordplay.
'design' indicates an anagram.
'in'+'coat'='incoat'
'incoat' with letters rearranged gives 'ACTION'.
'it happens' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for action that I've seen before include "Performance" , "Accomplishment" , "Deed, maybe battle" , "Litigation" , "Watch operating mechanism" .)