Crossword Genius

Wally removed loop from loom at workshop’s conclusion (5)

Ross

I believe the answer is:

twerp

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'wally' is the definition.
Both the answer and definition are singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the remainder of the clue works.

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(Other definitions for twerp that I've seen before include "Silly person" , "dope" , "Fool" , "mug" , "Pillock" .)

I've seen this clue in the Sydney Morning Herald.
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