Break up, being badly misled about soldier (9)
I believe the answer is:
dismantle
'break up' is the definition.
(I know this)
'badly misled about soldier' is the wordplay.
'badly' is an anagram indicator (letters in the wrong order).
'about' indicates putting letters inside.
'soldier' becomes 'ant' (soldier is a type of ant).
'misled' with letters rearranged gives 'dismle'.
'dismle' enclosing 'ant' is 'DISMANTLE'.
'being' is the link.
(Other definitions for dismantle that I've seen before include "Unrig" , "Strip down" , "Take apart" , "Undo" , "Take to bits" .)