Grandma's piercing bleat - 'a giant gorilla wants to eat me!' (6)
I believe the answer is:
banana
'a giant gorilla wants to eat me' is the definition.
I can't tell whether this defines the answer.
'grandma's piercing bleat' is the wordplay.
'grandma' becomes 'nan' (nan can informally mean a grandmother).
'piercing' is an insertion indicator (some letters pierce a hole in a word).
'bleat' becomes 'baa' (synonyms).
'nan' put within 'baa' is 'BANANA'.
Can you help me to learn more?
(Other definitions for banana that I've seen before include "Curved yellow fruit" , "that may be unzipped" , "Fruit item" , "Yellow fruit with slippery skin" , "Fruity type" .)