Wrap up one of many sentences? (3)
I believe the answer is:
lag
'wrap up one' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'many sentences?' is the wordplay.
'many' becomes 'l'.
'sentences?' becomes 'ag' (I can't explain this - if you can you should give a lot more credence to this answer).
'l'+'ag'='LAG'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for lag that I've seen before include "Fall behind or cover to prevent heat loss" , "An old one is a convict" , "Go too slow, fail to keep up" , "Wrap to protect from frost" , "Wrap water-pipes; fall behine" .)