The unclued lights are of a kind, verifiable in Brewer with the help of the red squares which must be read in order row by row. Ignore one apostrophe and an acute accent, elsewhere.

Across

9    Terrible President out on a limb at heart, troubled (10)

14    Courier company raises its charges (3)

16    Make one see red – possibly green and a touch of amber! (6)

17    Author moving gently, dropping article (5)

20    Mathematician coming across wife in Milton Keynes, say (3,4)

22    Travels by plane and a Roman road to Timeless Test (7)

24    Highbrow title is affected (7)

25    Sounding like Matilda’s creator’s Indian dishes...