Tablet broken in struggle (6)
I believe the answer is:
battle
'struggle' is the definition.
(a struggle or ordeal might be called a battle)
'tablet broken' is the wordplay.
'broken' indicates anagramming the letters.
'tablet' is an anagram of 'BATTLE'.
'in' is the link.
(Other definitions for battle that I've seen before include "Eg, Bosworth, Blenheim" , "Military fight" , "Wartime set piece" , "Sussex town" , "Fight between armies" .)