A maiden and a politician becoming romantic (7)
I believe the answer is:
amatory
'romantic' is the definition.
('amatory' can be a synonym of 'romantic')
'a maiden and a politician' is the wordplay.
'maiden' becomes 'm' (cricket abbreviation).
'and' says to put letters next to each other.
'politician' becomes 'tory' (I've seen this before).
'a'+'m'+'a'+'tory'='AMATORY'
'becoming' acts as a link.
(Other definitions for amatory that I've seen before include "relating to sexual desire?" , "Passionate" , "declaration of love" , "Loving" .)