Jumper possibly plunging? (1-4)
I believe the answer is:
v-neck
'jumper' is the definition.
Both the definition and answer are singular nouns.
Perhaps there's a link between them I don't understand?
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for v-neck that I've seen before include "Type of jumper" , "Sort of sweater" , "Type of sweater" , "Style of sweater" .)