Jumper that's taken in for protection? (10)
I believe the answer is:
turtleneck
'jumper' is the definition.
(type of jumper or sweater)
I don't understand the remainder of the clue.
(Other definitions for turtleneck that I've seen before include "Type of sweater" , "Sweater similar to polo" , "Type of jumper (between crew- and polo-)" , "clothing" , "High-topped jersey" .)