Premium (5)
'premium' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for bonus that I've seen before include "Additional wage" , "Additional payment to encourage productivity" , "Extra money paid on top of salary" , "Extra pay, perhaps at Christmas?" , "Extra income" .)
'premium' is the definition.
(thesaurus)
This is all the clue.
(Other definitions for reward that I've seen before include "Prize payment" , "Desert" , "Gift in recognition of achievement" , "It's given to reinforce good behaviour" , "Recompense, remunerate" .)
(Other definitions for top shelf that I've seen before include "adult" , "Where blue material may be found" .)