Cut some of the tablet cheaply (4)
I believe the answer is:
etch
'cut' is the definition.
(I've seen this in other clues)
'some of the tablet cheaply' is the wordplay.
'some of' indicates a hidden word.
'ETCH' is hidden within 'tablet cheaply'.
(Other definitions for etch that I've seen before include "Carve into surface, impress deeply" , "Design by eating out" , "Imprint vividly" , "Make deep lines" , "Cut using sharp instrument" .)