The unclued lights (33 with I) are of a kind, all verifiable in Chambers under the appropriate headword.
 

Across

 
1    Chief director takes one look at the league (13, two words)
8    Very best note on new piano (7)
10    1 and 10 down. Confused? I’m off! (7)
15    Orchestra giving half the chorus (5)
19    Mournful servant leaves travel agencies in trouble (7)
20    Throw back of heartless seaman in sea (7)
22    Awfully terrified, I’d leave and pine (7, two words)
23    Wader at small hut (5)
24    Scrutinises jail on board (5)
30    Sickly article about cinema (7)
35...