Nice lake enclosed by rural labourer (8)
I believe the answer is:
pleasant
'nice' is the definition.
('pleasant' can be similar in meaning to 'nice')
'lake enclosed by rural labourer' is the wordplay.
'lake' becomes 'l'.
'enclosed by' is an insertion indicator.
'rural labourer' becomes 'peasant' (I've seen this before).
'l' put inside 'peasant' is 'PLEASANT'.
(Other definitions for pleasant that I've seen before include "Enjoyable, nice" , "Refreshing" , "A greeable, affable" , "Nice, satisfying" , "Attractive" .)