Under stove, no end of abundant mushroom (6)
I believe the answer is:
agaric
'mushroom' is the definition.
(I've seen this before)
'under stove no end of abundant' is the wordplay.
'under' says to put letters next to each other.
'stove' becomes 'aga' (I've seen this before).
'no end of' means to remove the last letter.
'abundant' becomes 'rich' (associated in meaning).
'rich' with its final letter taken away is 'ric'.
'aga'+'ric' is 'AGARIC'.
(Other definitions for agaric that I've seen before include "fungal growth" , "Type of mushroom" , "Fungus of mushroom family" , "Fungus, eg, mushroom" .)