Leaving gallery, think about king’s dog (5)

I believe the answer is:

corgi

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'dog' is the definition.
(corgi is a kind of dog)

I can't explain the remainder of the clue.

(Other definitions for corgi that I've seen before include "Royal pet" , "The Queen's favourite?" , "Queen's dog?" , "Royal canine" , "Small Welsh dog with fox-like head" .)

I've seen this clue in The Times.

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