Heartless end for one in pressing for removal of the King (10)
I believe the answer is:
dethroning
'pressing for removal of the king' is the definition.
I can't tell whether this defines the answer.
'heartless end for one in' is the wordplay.
'heartless' says to hollow out the word (remove centre letters).
'end' becomes 'die'.
'for' is a charade indicator (letters next to each other).
'one in' becomes 'throning' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'die' with its middle taken out is 'de'.
'de'+'throning'='DETHRONING'
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