Gather together for hike (5)
I believe the answer is:
raise
I believe this is a double definition.
'gather together' is the first definition.
(thesaurus)
'hike' is the second definition.
('raise' can be a synonym of 'hike')
'for' acts as a link.
(Other definitions for raise that I've seen before include "More money from America" , "Lift; (to) levy (money)" , "Collect - increase in pay" , "Contact" , "Pick up" .)