Puzzle 10

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ClueSolution
reliabilitySTABILITY
STABILITY
it's "revolting"INSURGENCY
INSURGENCY
stand-up comic's arsenalJOKES
JOKES
dull, tediousPROSY
PROSY
rocking outJAMMING
JAMMING
a fast, low tennis serveCANNONBALL
CANNONBALL
former British PM BrownGORDON
GORDON