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 tell whether this defines the answer.
'unionist recalled vote against' is the wordplay.
'unionist' becomes 'kee' (I am not sure about this - if you are sure you should believe this answer much more).
'recalled' is a reversal indicator (to recall can mean to bring something back).
'vote' becomes 'nay' (I've seen this in another clue).
'against' says to put letters next to each other.
'nay' reversed gives 'yan'.
'kee' put 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" .)