Avocado green walls one found in bog? (4)
I believe the answer is:
ogre
'bog?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.
'avocado green walls one found' is the wordplay.
'one found' indicates a hidden word.
'OGRE' can be found hidden inside 'avocado green walls'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for ogre that I've seen before include "Giant of folklore, eats humans" , "Fairy tale giant" , "bad-tempered person" , "character in 'Puss in Boots'" , "Monstrous giant" .)