Possible Clues:

• Provided with restorative treatment and a service, having got old
• Service veteran cooked
• The 10 across are no chickens - there's the rub
• 'The bulk has got old, and there was the rub (8)'
• Artist Samuel's back rubbed
• Service offered to old people treated for aching joints?
• Lots of people of very mature years given physiotherapy?
• Service to elderly that's relieved tension, in a way
• Large amount on a pension, perhaps, worked hard
• Manipulated, as expense figures