Writing tablet (3)
'writing tablet' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for slate that I've seen before include "Grey stone; tab" , "Metamorphic rock that can be split into thin layers" , "Small blackboard - for deferred payments" , "Roofing material or credit recorder" , "Rubbish" .)
'writing tablet' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for pad that I've seen before include "Stuff the animal's foot" , "Block of paper sheets" , "protection for member" , "suitable for writers" , "Cushion" .)