High-tech spree leaves an uneasy feeling (3,6)
I believe the answer is:
the creeps
'an uneasy feeling' is the definition.
(I've seen this before)
'high-tech spree' is the wordplay.
'high' is an anagram indicator (like drunk).
'tech'+'spree'='techspree'
'techspree' is an anagram of 'THE CREEPS'.
'leaves' acts as a link.
(Other definitions for the creeps that I've seen before include "Unease" , "uneasy feeling" .)