Unionist recalled vote against Remain, having lost power (6)
I believe the answer is:
yankee
'remain having lost power' is the definition.
I can't judge whether this defines the answer.
'unionist recalled vote against' is the wordplay.
'unionist' becomes 'kee' (I can't explain this - if you can you should give a lot more credence to this answer).
'recalled' shows that the letters should be reversed in order (to recall can mean to bring something back).
'vote' becomes 'nay' (I've seen this in another clue).
'against' means one lot of letters go next to another.
'nay' reversed gives 'yan'.
'kee' after 'yan' is 'YANKEE'.
Can you help me to learn more?
(Other definitions for yankee that I've seen before include "US northerner to a southerner" , "Native of Northern US" , "American, perhaps a doodle dandy" , "US Civil War Federal soldier" , "One feeling sharp tug" .)