Republican Ted is running? It’s not certain (13)

I believe the answer is:

unpredictable

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'not certain' is the definition.
I can't judge whether this defines the answer.

'republican ted is running?' is the wordplay.
'is running?' indicates anagramming the letters (the letters run around to different places).
'republican'+'ted'='republicanted'
'republicanted' is an anagram of 'UNPREDICTABLE'.

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for unpredictable that I've seen before include "Changeable" , "erratic" , "Capricious" .)

I've seen this clue in The Times.

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