Bay, for example, some authors entered (5)
I believe the answer is:
horse
'bay for example' is the definition.
(I know that bay is a type of horse)
'some authors entered' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'HORSE' can be found hidden inside 'authors entered'.
(Other definitions for horse that I've seen before include "Vaulting --; -- sense" , "Steed" , "Vaulting block" , "Its mouth a reliable source of info" , "animal in the gym" .)