5 (hyphened) and 14 are types of 37. Remaining unclued lights are other types of 37, given in a form that is either 5 or 14. Unchecked and cross-checking letters in all unclued answers could give: GAPES INDECENTLY— A GOOEY MEAL. Ignore two accents in the completed grid.

Across

1  Check’s omitted in alcohol range (8)

8  Paint base on pen (4)

11  Man’s roughly northern (5)

13  250 farm animals in poem (7)

15  Battle about university sell-off (7)

17  A princess in opera? (4)

18  Why Doctor Who’s ordinary (5, two words)

19  Reserve fish, bagging pounds from the freezer? (7, hyphened)

23  Reasons I amended rubbings out...