Line of little dots on the radio (4)
I believe the answer is:
flex
This clue could be a double definition.
'line of little dots' is the first definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?
'the radio' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'on' is the link.
Can you help me to learn more?
(Other definitions for flex that I've seen before include "Bend - electrical cable" , "Supply contract" , "Electric wire" , "Tighten - bend" , "Bend - electric cable" .)