Romeo meets old politician in play (4)
I believe the answer is:
romp
'play' is the definition.
(I know that play can be written as romp)
'romeo meets old politician' is the wordplay.
'romeo' becomes 'r' (phonetic alphabet: alpha, bravo, charlie etc.).
'meets' is a charade indicator (letters next to each other).
'old' becomes 'o' (abbreviation).
'politician' becomes 'MP' (Member of Parliament).
'r'+'o'+'mp'='ROMP'
'in' acts as a link.
(Other definitions for romp that I've seen before include "Cut capers" , "Play boisterously" , "Boisterous party" , "Proceed energetically" , "Easy victory; play around energetically" .)