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Show that has eg Paddington Bear number chasing Oscar (11)

Ross

I believe the answer is:

ostentation

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'show' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

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(Other definitions for ostentation that I've seen before include "Showiness" , "show" , "Pretentious display" .)

I've seen this clue in The Times.
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