A Western power disrupting constitutional vote (5,4)
I believe the answer is:
straw poll
'vote' is the definition.
(I've seen this before)
'a western power disrupting constitutional' is the wordplay.
'western power' becomes 'wp' (this could be a standard abbreviation of which I'm unaware).
'disrupting' indicates putting letters inside (inside letters 'disrupt' the flow of outside one).
'constitutional' becomes 'stroll' (I've seen this before).
'a'+'wp'='awp'
'awp' placed within 'stroll' is 'STRAW POLL'.
Can you help me to learn more?
(Other definitions for straw poll that I've seen before include "Informal survey of votes" , "Informal canvass" , "Unofficial ballot" , "Unofficial vote taken to determine opinion" , "One checks opinion" .)