On which to get weaving! (4)

I believe the answer is:

loom

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

'weaving' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for loom that I've seen before include "Weaving - apparatus - overhang" , "Appear large and indistinct, to weave?" , "Appear indistinctly, in threatening form" , "Weaving frame - seem ominously close" , "Textile machine for weaving" .)

I've seen this clue in the Evening Standard.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.