Amiable agricultural labourer bagging fifty (8)
I believe the answer is:
pleasant
'amiable' is the definition.
(thesaurus)
'agricultural labourer bagging fifty' is the wordplay.
'agricultural labourer' becomes 'peasant' (peasant is a kind of agricultural labourer).
'bagging' indicates putting letters inside (I've seen this in other clues).
'fifty' becomes 'l' (roman numeral).
'peasant' enclosing 'l' is 'PLEASANT'.
(Other definitions for pleasant that I've seen before include "Nice, satisfying" , "Enjoyable, agreeable" , "Charming" , "Likeable, friendly" , "sweet?" .)