60% of navy vote for Cable (4)
I believe the answer is:
flex
'for cable' is the definition.
(type of flexible electric cable)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for flex that I've seen before include "Bend; electric lead" , "Bend (muscle?)" , "Tighten - bend" , "Electric wire" , "Bendable cord" .)