Rallies planned to recruit born politicians (8)
I believe the answer is:
liberals
'politicians' is the definition.
(liberal is a type of politician)
'rallies planned to recruit born' is the wordplay.
'planned' is an anagram indicator.
'to recruit' indicates putting letters inside (in the sense of bringing in).
'born' becomes 'b' (abbreviation next to the year of someone's birth).
'rallies' is an anagram of 'lierals'.
'lierals' going around 'b' is 'LIBERALS'.
(Other definitions for liberals that I've seen before include "Members of a British political party" , "They favour progress and reform" .)