Possible Clues:

• One liberating another snooker player's assistant shortly before snooker player?
• I'll make one securer when in dire straits
• Hero, perhaps
• Serial hero, often
• Save for this, that's what one does
• Deliverer
• Perhaps RNLI reserve gets sign right
• Deliverer (from danger)
• One saving for rent's first to secure representation
• Man making delivery errs badly, pocketing tip