Entertain by downing pint with energy (6)

I believe the answer is:

regale

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

I can't explain the rest of the clue.

(Other definitions for regale that I've seen before include "Entertain, delight" , "Entertain with stories" , "Entertain with conversation" , "Amuse with stories" , "Generously entertain (with)" .)

I've seen this clue in The Mirror.

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