Wild fear overcome next to lake (5)
I believe the answer is:
feral
'wild' is the definition.
('feral' can be similar in meaning to 'wild')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for feral that I've seen before include "Flare up, being fierce" , "Like a wild animal" , "Flare up in wild state" , "beastly" , "Escaped-into-wild (animal)" .)