Work with metal, having crawled out (3,4)

I believe the answer is:

arc weld

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'work with metal' is the definition.
I know nothing about this answer so I can't tell whether this works.

'crawled out' is the wordplay.
I cannot really understand how this works, but
an anagram of 'crawled' is 'arcweld' which is located in the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).

'having' acts as a link.

Can you help me to learn more?

I've seen this clue in The Irish Independent.

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