Shrub or pine, perhaps, in part of the Jurassic (7)
I believe the answer is:
juniper
'shrub' is the definition.
(I know that juniper is a type of shrub)
'pine perhaps in part of the jurassic' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'pine' is 'nipe' which is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'or' is the link.
Can you help me to learn more?
(Other definitions for juniper that I've seen before include "kind of berries" , "Evergreen shrub or small tree with berry-like cones" , "Shrub flavouring gin" , "Shrub providing flavour for gin" , "Coniferous shrub with berries used to make gin" .)