Potential menace inherent in volcanic rocks (4)
I believe the answer is:
croc
'potential menace inherent' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'in volcanic rocks' is the wordplay.
'in' indicates the answer is hidden within the clue.
'CROC' is hidden in the letters of 'volcanic rocks'.
Can you help me to learn more?
(Other definitions for croc that I've seen before include "Snapper" , "Fierce reptile" , "Long-tailed reptile (abbr)" , "Single-handed mariner's nemesis" , "Dangerous reptile" .)