They send water into dancers' shoes (5)
I believe the answer is:
pumps
'shoes' is the definition.
(pump is a kind of shoe)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for pumps that I've seen before include "Forces liquid to move; light shoes" , "Mechanical devices that move fluid or gas" , "Water-raising devices" , "Light dancing shoes - force air into" , "Moves fluid or gas by pressure or suction" .)