Answer Liberal member causing fear (5)
I believe the answer is:
alarm
'fear' is the definition.
(alarm is a kind of fear)
'answer liberal member' is the wordplay.
'answer' becomes 'a' (abbreviation eg in Q and A).
'liberal' becomes 'l' (abbreviation).
'member' becomes 'arm' (member can mean a limb).
'a'+'l'+'arm'='ALARM'
'causing' acts as a link.
(Other definitions for alarm that I've seen before include "Tocsin" , "Warning sound/device" , "Safety bell or alert signal" , "Warning siren" , "Frighten, warning" .)