Most favourable (7)

I think it could be either:

optimum

optimal

'most favourable' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for optimum that I've seen before include "Most favourable point" , "Most appropriate" , "Best, most favourable" , "model" , "Best (result)" .)

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

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