Former European leader to see about it (4)
I believe the answer is:
tito
'former european leader' is the definition.
(I've seen this in another clue)
'to see about it' is the wordplay.
'see about' is an insertion indicator.
'to' going around 'it' is 'TITO'.
(Other definitions for tito that I've seen before include "Yugoslavian freedom fighter and president" , "Josip Broz pseudonym" , "Adopted name of Josip Broz, Yugoslav leader" , "Yugoslav marshal" , "Statesman once" .)