Cardinal knew many on the inside (6)

I believe the answer is:

newman

'cardinal' is the definition.
(19th-century Cardinal John Henry Newman)

'knew many on the inside' is the wordplay.
'on the inside' says the answer is hidden in the clue.
'NEWMAN' is hidden within 'knew many'.

(Other definitions for newman that I've seen before include "'John Henry ..., founder of what is now UCD (6)'" , "Paul -, US actor" , "John Henry ---, C19 cardinal" , "Cardinal -- Paul, actor" , "Old Cardinal" .)

I've seen this clue in The Times.

Want a hint initially instead of a full solution? Install my app