Have come to a standstill at top right-hand corner!
5d Forest denizen surprisingly eternal in Peru (5,4) P???E,???E
8d Most of it could be green by the end of the century (6) ???R?Y
10a A group performing in desert (7) ??A?D??
14a Maybe it's a perk at end of day from union funds (6,3) S???E?,P??(PAY?)
Thank you all for your help - as usual, my mind was on completely the wrong track on a couple of them so I would never have got them - even though the answer is so obvious when you see it!