Unclued lights are words from a famous poem whose title will appear in the completed grid and must be shaded. Elsewhere, ignore an accent.
 

Across

4    Fox then dish regulator (11, hyphened)
11    Foals need bananas like certain bats (9, hyphened)
12    Some ignore a great bore (5)
13    Payments to Pope in old coin and notes (7)
14    Nun pig ignored for a long time (3)
15    Tidy number dine on beef (4)
20    Underhand goblin only within Quebec (7)
21    Liqueur I get with round (7)
24    Tinker and MC possibly in conversation (6)
25    Powdered fruit sustains me (6)
29    Cardinal we inducted in the middle (5)
31    Girl digs timeless proverbs (6)
33   ...