Not still working around pine frame of espalier (2,6)
I believe the answer is:
no longer
'not still' is the definition.
('no longer' is the opposite to 'still')
'working around pine frame of espalier' is the wordplay.
'working' becomes 'on' (e.g. a machine is working or on).
'around' shows that the letters should be reversed in order.
'pine' becomes 'long' (to pine for something is to long for it).
'frame of' suggests removing the centre (use the outside letters which frame the word).
'espalier' with its centre taken out is 'er'.
'on' written backwards gives 'no'.
'no'+'long'+'er'='NO LONGER'
(Other definitions for no longer that I've seen before include "Someone who doesn't dream" , "a person without yearnings?" , "One not disposed to pining" , "Not as formerly" .)