Initially runs off with politician for sexual high jinks (4)

I believe the answer is:
romp
'sexual high jinks' is the definition.
'romp' can be an answer for 'jinks' (I have seen 'High jinks' mean 'romp' so perhaps 'jinks' could also mean 'romp'). I am not sure about the 'sexual high' bit.
'initially runs off with politician' is the wordplay.
'initially' says to take the initial letters.
'with' means one lot of letters go next to another.
'politician' becomes 'MP' (Member of Parliament).
The initial letters of 'runs off' is 'ro'.
'ro'+'mp'='ROMP'
'for' is the link.
Can you help me to learn more?
(Other definitions for romp that I've seen before include "Cut capers" , "Boisterous activity" , "Frolic" , "sexy fun" , "Frisk - gambol" .)
