Just two queries on this one.
6d - "Middle one of thirteen (5) - I have _E_A_.
I'm thinking "heart" from "middle" but how would that fit in with 13?
14d - "Keep head when marksman is in vessel" (9) - answer would seem to be "Castellan" - chief of a keep or castle. OK - the "vessel" is "can" but what is the connection between "stella" and "marksman"? If drink-related I can see that "Crossbow" would fit in better on this theme - or is Sagittarius the link?
I look forward to your replies.