Remain behind the wicket? (4)

I believe the answer is:

keep

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'remain' is the definition.
(I know that keep is a more specific form of the action remain)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for keep that I've seen before include "Retain in old castle (4)" , "Castle tower; cost of maintenance" , "Main tower within the walls of a castle" , "Hold - part of castle" , "honour" .)

I've seen this clue in the Evening Standard.

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