Raise price for trek in hills (4)
I believe the answer is:
hike
This might be a double definition.
'raise price' is the first definition.
'hike' can be an answer for 'raise' (hiking is a kind of raising). I am not certain of the 'price' bit.
'trek in hills' is the second definition.
'hike' can be an answer for 'trek' (I've seen this in another clue). I'm unsure of the 'in hills' bit.
'for' is the link.
Can you help me to learn more?
(Other definitions for hike that I've seen before include "Tramp" , "Walking tour" , "Long, hard walk" , "physical exercise" , "Long march; increase" .)