Swallows hastily in bars (5)

I believe the answer is:

bolts

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This might be a double definition.

'swallows hastily' is the first definition.
'bolts' can be an answer for 'swallows' (bolting is a kind of swallowing). I am not sure about the 'hastily' bit.

'bars' is the second definition.
(bolt is a kind of bar)

'in' is the link.

Can you help me to learn more?

(Another definition for bolts that I've seen is " Door fasteners".)

I've seen this clue in The Globe and Mail.

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