Free tablet in Waterloo? (6)

I believe the answer is:

battle

'waterloo?' is the definition.
(waterloo is a kind of battle)

'free tablet' is the wordplay.
'free' indicates an anagram.
'tablet' is an anagram of 'BATTLE'.

'in' is the link.

(Other definitions for battle that I've seen before include "Warfare" , "Skirmish" , "Naval engagement" , "Eg, Bosworth, Blenheim" , "Military engagement" .)

I've seen this clue in The Times.

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