Crossword Genius

Fold in collars of turtleneck (4)

Ross

I believe the answer is:

tuck

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'fold' is the definition.
(I know that tuck is a type of plait)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for tuck that I've seen before include "Schoolboy grub like sweets and cakes" , "Fold - friar!" , "Friar of Sherwood" , "Pleat in garment" , "School food" .)

I've seen this clue in the Sydney Morning Herald.
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