Telegraph GK Crossword, 781

[Billy_Bonka]

1a- Deputy and assistant for high-ranking official in Royal household (4-11) ????-C?A?B?R?A?N
17a- Old verse form of six six-lined stanzas (7) SES?I?A
1d- Tissue that can be controlled by one's will (9,6)
??L?N?A?Y?U?C?E
15d- French spelling for a department of northwestern France (9) F?N?S?E?E
21d- Phrase from Latin meaning earnestly (2,5)
?X / A?I?O

Any help much appreciated.

[rootshall]

1a vice chamberlain

15d finistere

1d voluntary muscle

[Four Clubs]

1ac Vice Chamberlain
1dn voluntary muscle
I think 15dn was Finistere but check, please.
Four Clubs

[shaneystar2]

21d ex Animo
17A Sestina

[Billy_Bonka]

Thanks Folks.