Thanks everybody. It looks like 'silver' is correct - Long John Silver was hired to be the cook on the Hispaniola. This also fits with the 'stumped' ian mentioned above.
10A looks like EYE for : pit wheel E?E
29D looks like MAROR for :herbs spoil men (MAR + OR I guess)
17D looks like DIKTAT (or DITTIT) for : sanction ?I?T?T