Suggests spot is exploding (6)

I believe the answer is:

posits

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'suggests' is the definition.
Although both the answer and definition are verbs in their -s form, I can't understand how they can define each other.

'spot is exploding' is the wordplay.
'exploding' indicates an anagram.
'spot'+'is'='spotis'
'spotis' with letters rearranged gives 'POSITS'.

Can you help me to learn more?

(Other definitions for posits that I've seen before include "Assumes as fact - is post involved?" , "Suggests, postulate" , "submits" .)

I've seen this clue in The Sun.

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