Join by dint of a bit of tinkering? (4)

I believe the answer is:

knit

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

'join' is the definition.
(knitting is a kind of joining)

I can't explain the remainder of the clue.

(Other definitions for knit that I've seen before include "Arrears" , "Use needles and wool" , "Tighten (eyebrows) in a frown; unite" , "mesh" , "Unite closely" .)

I've seen this clue in the Evening Standard.

Want a hint initially instead of a full solution? Install my app