Regularly burnt, with green being thin on the ground (8)

I believe the answer is:

uncommon

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'thin on the ground' is the definition.
'uncommon' can be an answer for 'thin' (thesaurus). I am unsure of the 'on the ground' bit.

'regularly burnt with green' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'with' is a charade indicator (letters next to each other).
'green' becomes 'common' (synonyms).
The alternate letters of 'burnt' are 'un'.
'un'+'common'='UNCOMMON'

'being' acts as a link.

Can you help me to learn more?

(Other definitions for uncommon that I've seen before include "Infrequent" , "Extraordinary - rare" , "Rarely seen" , "Atypical" , "Rare, unusual" .)

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

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