Patrick Fitzgerald right about cap? (8)

I believe the answer is:

patellar

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'patrick fitzgerald right about cap?' is the definition.
I can't tell whether this defines the answer.

'patrick fitzgerald right' is the wordplay.
'patrick' becomes 'pat' (short for Patrick).
'fitzgerald' becomes 'Ella' (musician Ella Fitzgerald).
'right' becomes 'r' (common abbreviation).
'pat'+'ella'+'r'='PATELLAR'

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I've seen this clue in the Sydney Morning Herald.

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