Most of the small streams provide excitement (7)
I believe the answer is:
thrills
'excitement' is the definition.
(I've seen this before)
'most of the small streams' is the wordplay.
'most of' means to remove the last letter.
'small streams' becomes 'rills' (I've seen this before).
'the' with its last letter taken off is 'th'.
'th'+'rills'='THRILLS'
'provide' is the link.
(Other definitions for thrills that I've seen before include "Delights" , "Hair-raising experiences" , "Waves of excited feelings" , "Excites" , "Excitement" .)