One rambling president splitting House of Representatives (5)
I believe the answer is:
hiker
'one rambling' is the definition.
(a hiker rambles around)
'president splitting house of representatives' is the wordplay.
'president' becomes 'ike' (nickname of Dwight Eisenhower).
'splitting' means one lot of letters goes inside another (some letters split a word into two).
'house of representatives' becomes 'hr' (I can't justify this - if you can you should give a lot more credence to this answer).
'ike' going into 'hr' is 'HIKER'.
Can you help me to learn more?
(Other definitions for hiker that I've seen before include "Someone walking (with backpack?)" , "Backpacker" , "Someone who goes on an extended walk for pleasure" , "Distance walker" , "Person on long walk" .)