Injured boss I'm carrying up mountain as living material (9)

'living material' is the definition.
(bioplasm refers to living matter)

'injured boss i'm carrying up mountain' is the wordplay.
'injured' is an anagram indicator.
'carrying' means one lot of letters goes inside another.
'up' shows that the letters should be reversed in order (in down clue: letters go upwards).
'mountain' becomes 'alp' (alp is a kind of mountain**).
'alp' written backwards gives 'pla'.
'boss'+'im'='bossim'
'bossim' with letters rearranged gives 'biosms'.
'biosms' placed around 'pla' is 'BIOPLASMS'.

'as' is the link.