Possible Clues:

• Fourth strange knock at rub-a-dub-dub
• Percussion rhythm
• Put end to bland dance without energy - time for rhythmic sound!
• Foot-tapper's need
• Rataplan
• Not talking about right to have a meal with percussion
• Dead spirit with first four characters in 27 across is heard in the pit
• Snare sound
• Heard at march up north, medic expressing hesitancy at policeman's job
• Wobbly tum bared for a tattoo