Entered the lists to have Jack removed (7)

I believe the answer is:

jousted

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'entered the lists' is the definition.
The answer and definition can be both related to competing as well as being past participle verbs.
Maybe you can see an association between them that I can't see?

'jack removed' is the wordplay.
'jack' becomes 'J' (playing card abbreviation).
'removed' becomes 'ousted' (ousting is a kind of removing).
'j'+'ousted'='JOUSTED'

'to have' acts as a link.

Can you help me to learn more?

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