Form a queue at the back (5)

I believe the answer is:

plait

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'form' is the definition.
(I know that plait is a type of bend)

I can't explain the rest of the clue.

(Other definitions for plait that I've seen before include "Interweave (lengths of hair)" , "Rope-like length of hair" , "Interlaced length of hair" , "A rope of hair (5)" , "Stranded length of hair" .)

I've seen this clue in The Globe and Mail.

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