Clear part of ground I cultivated, on reflection (5)
I believe the answer is:
lucid
'clear' is the definition.
('lucid' can be similar in meaning to 'clear')
'part of ground i cultivated on reflection' is the wordplay.
'part of' says the answer is hidden in the clue.
'on reflection' says the letters should be written backwards.
'dicul' can be found hidden inside 'ground i cultivated'.
'dicul' in reverse letter order is 'LUCID'.
(Other definitions for lucid that I've seen before include "Shining, clearly" , "Crystal clear" , "Transparently clear" , "Compos mentis" , "Clearly presented and easily understood" .)