Hope dashed with new call (5)
I believe the answer is:
phone
'call' is the definition.
('phone call' can be a synonym of 'call')
'hope dashed with new' is the wordplay.
'dashed with' is an anagram indicator.
'new' becomes 'n'.
'hope' mixed up with 'n' makes 'PHONE'.
(Other definitions for phone that I've seen before include "Ring (someone)" , "Call, ring" , "Receiver" , "It converts sounds into signals and back again" , "Communication device" .)