Become worried that you’ll be caught by the cannibal? (3,2,1,4)

'caught by the cannibal?' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'become worried that you'll be' is the wordplay.
I cannot really see how this works, but
'become' could be 'get' (synonyms) and 'get' is found in the answer.
'be' could be 'stew' (stewing is a kind of being) and 'stew' is found in the answer.
The remaining letters 'ina' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?