Clearly evident insect inside weed (8)
I believe the answer is:
plantain
'weed' is the definition.
(I've seen this before)
'clearly evident insect inside' is the wordplay.
'clearly' becomes 'plain' (synonyms).
'evident insect' becomes 'ant' (ant is a kind of insect. I am not sure about the 'evident' bit.).
'inside' indicates putting letters inside.
'plain' enclosing 'ant' is 'PLANTAIN'.
Can you help me to learn more?
(Other definitions for plantain that I've seen before include "Large banana - weed" , "Sort of banana" , "Green-skinned banana" , "Low-growing plant; type of banana" , "Pal at inn (anag)" .)