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Move to and fro round gauge, it's used during election (11)

Ross

I believe the answer is:

swingometer

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'used during election' is the definition.
I can't judge whether this defines the answer.

'move to and fro round gauge' is the wordplay.
'move to and fro' becomes 'swing' (I've seen this in another clue).
'round' becomes 'o' (round can mean a round object).
'gauge' becomes 'meter' (I've seen this before).
'swing'+'o'+'meter'='SWINGOMETER'

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for swingometer that I've seen before include "electoral machinery" , "Device demonstrating changes in voting intention" , "Election night pendulum?" .)

I've seen this clue in The Telegraph.
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