Crossword Genius

How a jigsaw must be worked out? (6,8)

Ross

I believe the answer is:

pieced together

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

'worked out?' is the definition.
The definition and answer can be both to do with contact as well as being past participle verbs.
Maybe you can see a link between them that I don't see?

I don't understand how the rest of the clue works.

Can you help me to learn more?

I've seen this clue in The Telegraph.
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