Possible Clues:

• Might Mark blitz clues?
• Biceps, e.g
• Perhaps calf is a beast of burden carrying sack regularly
• Bodyguards, informally
• Arm-wrestling asset
• Might millions crack clues?
• Body part whose name comes from the Latin for 'little mouse'
• Patron of the arts, catching cold, left beef
• Might mark cryptic clues
• Strength of sea creature, we hear