Crossword Genius

Many trees of back rest (6)

Ross

I believe the answer is:

forest

I'm a little stuck... Click here to teach me more about this clue!

'many trees of back rest' is the definition.
I can't judge whether this defines the answer.

'of back rest' is the wordplay.
'back' says the letters should be written backwards.
'of' written backwards gives 'fo'.
'fo'+'rest'='FOREST'

Can you help me to learn more?

(Other definitions for forest that I've seen before include "Sherwood or Pine, say" , "Thick growth of trees" , "green area" , "Grow more rigid" , "Large, densely-wooded area" .)

I've seen this clue in the Sydney Morning Herald.
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