Greek god in charge provoking fear (5)
I believe the answer is:
panic
'fear' is the definition.
(I know that panic is a type of fear)
'greek god in charge' is the wordplay.
'greek god' becomes 'pan' (Pan is an example).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'pan'+'ic'='PANIC'
'provoking' acts as a link.
(Other definitions for panic that I've seen before include "Horror" , "Sudden feeling of terror" , "Flap" , "State of overwhelming fear" , "Alarm, scare" .)