Eight unclued entries (two of two words, one hyphened) form a folk rhyme used as the basis for the first lines of a work whose title is the other unclued entry (hyphened). Its author (5 cells) must be highlighted. Elsewhere, ignore two or three apostrophes and an accent.
 

Across

1    Needing complex course, my job’s on the line  (12, hyphened)
10    Seaman jailed by extremely benign officer (4)
12    Suspect fresh angle will show solar phenomenon (10, two words)
14    Quadruped found in centre of cowboy’s rope (3)
15    More than one ancient stole prayer books (8)
17    Is consecrating old priest leaving marks? (5)
19    Pirate chief...