Involve troublemaker, one Conservative entering after time (9)
I believe the answer is:
implicate
'involve' is the definition.
(thesaurus)
'troublemaker one conservative entering after time' is the wordplay.
'troublemaker' becomes 'imp' (I've seen this before).
'one' becomes 'i' (Roman numeral).
'conservative' becomes 'c' (abbreviation commonly used in UK politics).
'entering' indicates putting letters inside.
'after time' becomes 'late' (I've seen this before).
'i'+'c'='ic'
'ic' inserted into 'late' is 'licate'.
'imp'+'licate'='IMPLICATE'
(Other definitions for implicate that I've seen before include "Involve in a crime, ensnare" , "Involve in a crime, give evidence accordingly" , "Suggest someone is involved or took part in a crime" , "Suggest someone else is involved in your crime" , "Involve in, say a crime" .)