Writer's block: medicine needed (6)

I believe the answer is:

tablet

I'm a little stuck... Click here to teach me more about this clue!

'writer's block' is the definition.
'tablet' can be an answer for 'block' (tablet is a kind of block). I am unsure of the 'writer's' bit.

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tablet that I've seen before include "Pill; writing pad" , "Flat slab (of stone, etc)" , "PC" , "Small computer" , "pill needed" .)

I've seen this clue in The Sun.

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