Happy when part of the plot's simplified (7)

I believe the answer is:

pleased

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

'part of the plot's simplified' is the wordplay.
'part of the plot's' becomes 'pl' (I am not sure about this - if you are sure you should believe this answer much more).
'simplified' becomes 'eased' (I've seen this in another clue).
'pl'+'eased'='PLEASED'

'when' acts as a link.

Can you help me to learn more?

(Other definitions for pleased that I've seen before include "Well satisfied" , "Glad" , "Feeling satisfaction" , "Gratified" , "Content" .)

I've seen this clue in the Evening Standard.

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