Uncovered tall conifer and plant from mountainous region (6)
I believe the answer is:
alpine
'plant from mountainous region' is the definition.
'uncovered tall conifer' is the wordplay.
'uncovered' means to look at the middle letters.
'conifer' becomes 'pine' (pine is a kind of conifer).
The centre of 'tall' is 'al'.
'al'+'pine'='ALPINE'
'and' is the link.
(Other definitions for alpine that I've seen before include "To do with great European mountains" , "Relating to a European mountain range" , "from Germany, Austria etc" , "seen in rocky state?" , "Relating to high mountains" .)