Besides, Hal's out in the hut (4)

I believe the answer is:

also

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

I don't understand the remainder of the clue.

(Other definitions for also that I've seen before include "item's rarely used now for this" , "Likewise" , "Item" , "Old" , "'Besides, moreover (4)'" .)

I've seen this clue in the Evening Standard.

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