Put tool back in sack (4)

I believe the answer is:

loot

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

'sack' is the definition.
(I've seen this in another clue)

'put tool back' is the wordplay.
'tool' anagrams to 'LOOT'.
Though, I'm not clear how this is indicated.

'in' is the link.

Can you help me to learn more?

(Other definitions for loot that I've seen before include "Plunder, pillage" , "familiar officer" , "Steal property (in war)" , "Booty; sack" , "Booty, spoils" .)

I've seen this clue in The Irish News.

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