Case of professional too young for sacking (10)

I believe the answer is:

plunderage

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'sacking' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I can't see?

'case of professional too young' is the wordplay.
'case of' suggests removing the centre (like emptying a case).
'too young' becomes 'underage' (I've seen this in another clue).
'professional' with its middle removed is 'pl'.
'pl'+'underage'='PLUNDERAGE'

'for' acts as a link.

Can you help me to learn more?

I've seen this clue in The Times.

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