Natural covering of wild nutmeg under tree, oddly (8)

'natural covering' is the definition.
(tegument is a kind of natural covering)

'wild nutmeg under tree oddly' is the wordplay.
'wild' indicates anagramming the letters.
'under' means one lot of letters go next to another.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternating letters of 'tree' are 'te'.
'nutmeg' is an anagram of 'gument'.
'gument' put after 'te' is 'TEGUMENT'.

'of' is the link.