Price rise beginning to rile rambler (5)
I believe the answer is:
hiker
'rambler' is the definition.
(I've seen this before)
'price rise beginning to rile' is the wordplay.
'price rise' becomes 'hike' (I've seen this in another clue).
'beginning to' says to take the initial letters.
The initial letter of 'rile' is 'r'.
'hike'+'r'='HIKER'
(Other definitions for hiker that I've seen before include "Walker for pleasure" , "Person on long walk" , "One on long walk" , "Someone who goes on an extended walk for pleasure" , "Long-distance walker" .)