Extremely sorry — divided by 49 + 50 is just absurd! (5)

I believe the answer is:

silly

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'just absurd' is the definition.
'silly' can be an answer for 'absurd' (I've seen this before). I'm not certain of the 'just' bit.

'extremely sorry divided by 49 50' is the wordplay.
'extremely' means to remove the middle letters (only the extremes of the word are used).
'divided by' is an insertion indicator (inserted letters divide the word).
'49' becomes 'IL' (Roman numerals).
'50' becomes 'l' (Roman numeral).
'sorry' with its centre taken out is 'sy'.
'il'+'l'='ill'
'sy' going around 'ill' is 'SILLY'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for silly that I've seen before include "Ridiculous, frivolous" , "Potty or barmy" , "Stupid" , "Goose" , "Not serious" .)

I've seen this clue in The Guardian.

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