Lost and found note with too much inside (9)

I believe the answer is:

forgotten

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'lost' is the definition.
(similar in meaning)

'found note with too much inside' is the wordplay.
'found' becomes 'forge' (I've seen this in other clues).
'note with' becomes 'n' (abbreviation. I am not sure about the 'with' bit.).
'too much' becomes 'OTT' (short for over the top).
'inside' indicates putting letters inside.
'forge'+'n'='forgen'
'forgen' placed around 'ott' is 'FORGOTTEN'.

'and' is the link.

Can you help me to learn more?

(Other definitions for forgotten that I've seen before include "Ignored" , "Overlooked" , "Not accessible to memory" , "Unremembered" , "left behind" .)

I've seen this clue in The Telegraph.

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