... could be used for this English forest following another tree (8)
I believe the answer is:
firewood
'could be used for this' is the definition.
The definition suggests a singular noun which matches the answer.
'english forest following another tree' is the wordplay.
'english' becomes 'e' (abbreviation).
'forest' becomes 'wood' ('wood' can be a synonym of 'forest').
'following' says to put letters next to each other.
'another tree' becomes 'fir' (fir is a kind of tree. I am not sure about the 'another' bit.**).
'e'+'wood'='ewood'
'ewood' put after 'fir' is 'FIREWOOD'.
Can you help me to learn more?
(Other definitions for firewood that I've seen before include "Substance for burning" , "Fuel from trees" , "Logs etc for fuel" , "Fuel for the grate" , "Kindling for 17 across" .)