24a Sticky stuff left in motorway because of poor light, 5 letter word, possibly GLOOM?
finally
13s Stock does not more inside, so they say- 10 letter word S?P?O?????- supposedly?
24a Gloom is correct, Left (L) in Goo (sticky stuff) with M (motorway)
13d Supposedly is correct. Supply (stock) with 'does' moving inside