Seeing roll, one jokingly pulled sailor back (5)

I believe the answer is:

bagel

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'seeing roll' is the definition.
'bagel' can be an answer for 'roll' (bagel is a type of roll). I am not certain of the 'seeing' bit.

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

Can you help me to learn more?

(Other definitions for bagel that I've seen before include "Ring-shaped bread roll" , "round fare" , "Ring-shaped bread product" , "Hard doughnut-shaped roll" , "Toroidal bread roll" .)

I've seen this clue in The Guardian.

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