Deity in charge of hysteria (5)
I believe the answer is:
panic
'hysteria' is the definition.
(hysteria is uncontrollable panic)
'deity in charge' is the wordplay.
'deity' becomes 'pan' (Pan is an example).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'pan'+'ic'='PANIC'
'of' acts as a link.
(Other definitions for panic that I've seen before include "Have kittens" , "Sudden overpowering anxiety" , "Flap" , "Sudden uncontrollable fear" , "mass hysteria?" .)