Massive build-up of earthy peat (4)
I believe the answer is:
hype
'massive build-up' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'of earthy peat' is the wordplay.
'of' indicates the answer is hidden within the clue.
'HYPE' can be found hidden inside 'earthy peat'.
Can you help me to learn more?
(Other definitions for hype that I've seen before include "Sales gimmickry" , "Overdo promotion" , "Excess publicity" , "Promotional material" , "Over the top publicity" .)