The unclued lights (one of two words) are of a kind. Elsewhere, ignore three accents.
 

Across

 
1    Unethical point of an Aesop fable (6)
11    Improve, making Oriel, accommodated by a fellow (10)
13    3 in Casablanca in the wet season (5)
14    This psychotherapist poor Leonard can’t take on (5)
15    Oration about province (7)
18    Non-A roads are where to meet (6)
19    It’s under the window, not moving, timeless (4)
22    Old-fashioned people buried here? (6)
24    Snouted Indian animal chewed bowler hats, out West (9, two words)
25    Round, soft growth (5)
26    Ice-cream’s not on froth (5)
28    300 steal luggage item (9)
30    Game for a sound hitter?...