In favour of new set of trees (6)

I believe the answer is:

forest

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'of trees' is the definition.
The definition suggests a singular noun which matches the answer.

'in favour of new set' is the wordplay.
'in favour' becomes 'for' (as in being for a particular cause).
'of new' is an anagram indicator (I've seen 'new' mean this).
'set' is an anagram of 'est'.
'for'+'est'='FOREST'

Can you help me to learn more?

(Other definitions for forest that I've seen before include "Thief (rhyming slang)" , "See 15" , "Thick growth of trees" , "Land covered with trees" , "Large wood" .)

I've seen this clue in The Mirror.

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