Show pleasure in a catty way (4)

I believe the answer is:

purr

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

I cannot understand how the rest of the clue works.

(Other definitions for purr that I've seen before include "content? I might" , "Sound of happy animal" , "Tiddles' sound" , "Sound of feline content" , "Sound of contentment" .)

I've seen this clue in The Irish Independent.

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