Go over way to entertain constant moaner (10)
I believe the answer is:
crosspatch
'moaner' is the definition.
'go over way to entertain constant' is the wordplay.
'go over' becomes 'cross' (to cross over).
'way' becomes 'path' (synonyms).
'to entertain' indicates putting letters inside.
'constant' becomes 'c' (mathematical abbreviation).
'path' placed around 'c' is 'patch'.
'cross'+'patch'='CROSSPATCH'
(Other definitions for crosspatch that I've seen before include "Ill-natured type" , "Ill-tempered person" , "Grump" , "Grumpy type" , "Irascible type" .)