Battiest, dottiest (7)

I believe the answer is:

daftest

This clue is a double definition.

'battiest' is the first definition.
('daft' can be a synonym of 'batty')

'dottiest' is the second definition.
('daft' can be a synonym of 'dotty')

(Another definition for daftest that I've seen is " Battiest, dottiest".)

I've seen this clue in the Irish Times (Simplex) and The Irish Times.

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