Reasonable entertainment (4)
I believe the answer is:
fair
I believe this is a double definition.
'reasonable' is the first definition.
(I know that reasonable can be written as fair)
'entertainment' is the second definition.
(as in a fun fair)
(Other definitions for fair that I've seen before include "Sign following Pisces" , "Reasonable; pretty" , "Even-handed travelling show?" , "All clues should be" , "The mart is blond" .)