Writing paper and a pill (6)
I believe the answer is:
tablet
'a pill' is the definition.
('tablet' can be a synonym of 'pill')
'writing paper' is the wordplay.
'writing' becomes 'tab' (tab is a kind of writing).
'paper' becomes 'let' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'tab'+'let'='TABLET'
'and' is the link.
Can you help me to learn more?
(Other definitions for tablet that I've seen before include "Small bar of soap" , "A small pill or an inscribed panel on wall" , "Pill; writing pad" , "Medicine - flat slab - computer" , "Handheld personal computer" .)