What has insect got into? Obvious: a fruit (8)
I believe the answer is:
plantain
'fruit' is the definition.
(I know that plantain is a type of banana)
'what has insect got into?' is the wordplay.
'what' becomes 'pla' (I can't justify this - if you can you should believe this answer much more).
'has' indicates putting letters inside.
'insect' becomes 'ant' (ant is a kind of insect).
'got' says to put letters next to each other.
'into?' becomes 'in'.
'pla' going around 'ant' is 'planta'.
'planta'+'in'='PLANTAIN'
'obvious a' acts as a link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for plantain that I've seen before include "Cooking banana" , "Tropical plant like a banana" , "Shrub; green banana" , "Low-growing plant; type of banana" , "Large banana - weed" .)