Neat point about turnover of the old plant (5)
I believe the answer is:
oxeye
'plant' is the definition.
The answer is an example.
'neat point about turnover of the old' is the wordplay.
'neat' becomes 'ox' (I've seen this in other clues).
'point' becomes 'e' (E is an example).
'about' is a charade indicator (letters next to each other).
'turnover of' says the letters should be written in reverse (I've seen 'turnover' mean this).
'the old' becomes 'ye'.
'ye' back-to-front is 'ey'.
'e' put after 'ey' is 'eye'.
'ox'+'eye'='OXEYE'
(Other definitions for oxeye that I've seen before include "White and yellow daisy" , "Wild chrysanthemum" , "Variety of daisy" , "Kind of daisy" , "Wild daisy" .)