Pull strings? (6)

I think it could be either:

Which length description are you looking for?:

undo

'pull strings?' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for undo that I've seen before include "Ruin or loose" , "Cancel, annul; open" , "Disentangle" , "Release button, knot etc" , "Open button or ruin" .)

I've seen this clue in the Penny Press.

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