The twit dropped it? Rot! Absolute nonsense! (7)

I believe the answer is:

twaddle

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'absolute nonsense' is the definition.
'twaddle' can be an answer for 'nonsense' (informal term for nonsense or rubbish). I'm unsure of the 'absolute' bit.

'the twit dropped it? rot' is the wordplay.
'dropped' indicates named letters should be taken away.
'rot' becomes 'addle' (I've seen this before).
'twit' with 'it' taken out is 'tw'.
'tw'+'addle'='TWADDLE'

Can you help me to learn more?

(Other definitions for twaddle that I've seen before include "Bull" , "Moonshine" , "Foolish speech" , "Foolish words" , "Hot air" .)

I've seen this clue in the Evening Standard.

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