Joining together son with family name from Dallas (6)

I believe the answer is:

sewing

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'joining' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Maybe there's a link between them I don't understand?

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

Can you help me to learn more?

(Other definitions for sewing that I've seen before include "Darning" , "Working with a needle" , "Needlework" , "Joining by stitching" , "Genteel pursuit" .)

I've seen this clue in The Guardian.

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