Had got in and somehow undone, is the insinuation (8)

I believe the answer is:

innuendo

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'the insinuation' is the definition.
('innuendo' can be a synonym of 'insinuation')

'had got in and somehow undone' is the wordplay.
'had got in' becomes 'i' (I can't explain this - if you can you should give a lot more credence to this answer).
'and' becomes 'n' (common abbreviation for 'and').
'somehow' indicates anagramming the letters.
'undone' anagrammed gives 'nuendo'.
'i'+'n'+'nuendo'='INNUENDO'

'is' acts as a link.

Can you help me to learn more?

(Other definitions for innuendo that I've seen before include "Malicious insinuation" , "Disparaging suggestion" , "Suggestive remark" , "Slur" , "sneaky reference" .)

I've seen this clue in the Evening Standard.

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