Lent a gun to sort things out (8)

I believe the answer is:

untangle

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'out' is the definition.
Although both the answer and definition are verbs in their base form, I cannot understand how one could define the other.

'lent a gun to sort' is the wordplay.
'to sort' is an anagram indicator.
'lent'+'a'+'gun'='lentagun'
'lentagun' is an anagram of 'UNTANGLE'.

'things' acts as a link.

Can you help me to learn more?

(Other definitions for untangle that I've seen before include "Straighten out, free from mesh" , "'Unpick, unravel (8)'" , "Make free from disorder" , "Extricate" , "Sort out" .)

I've seen this clue in The Irish News.

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