The two are not, I gathered, rats! (11)

I believe the answer is:

botheration

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'the two are not i gathered rats' is the definition.
I can't tell whether this defines the answer.

'the two are not i gathered' is the wordplay.
'the two' becomes 'both' (synonyms).
'gathered' indicates anagramming the letters.
'are'+'not'+'i'='arenoti'
'arenoti' anagrammed gives 'eration'.
'both'+'eration'='BOTHERATION'

Can you help me to learn more?

(Other definitions for botheration that I've seen before include "Worry - darn it!" , "dammit!" , "drat it!" .)

I've seen this clue in The Telegraph.

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