Crossword Genius

Mug Times sent into closed prison (4,3)

Ross

I believe the answer is:

toby jug

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for toby jug that I've seen before include "Man-shaped drinking pot" , "Drinking mug in the shape of a stout man wearing a tricorn" , "Beer mug in the shape of a man in a tricorn hat" , "Vessel in the shape of a stout man" , "Type of tankard" .)

I've seen this clue in The Times.
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