Tablet halved: centre is deadly (6)

I believe the answer is:

lethal

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'is deadly' is the definition.
('lethal' can be a synonym of 'deadly')

'tablet halved centre' is the wordplay.
'halved' means to take half the letters.
'centre' becomes 'hal' (I am not sure about this - if you are sure you should believe this answer much more).
'tablet' cut in half is 'let'.
'let'+'hal'='LETHAL'

Can you help me to learn more?

(Other definitions for lethal that I've seen before include "Deadly or mortal" , "Liable to cause death" , "Terminal" , "bringing down the curtain" , "Noxious" .)

I've seen this clue in The Guardian.

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