Loss of marbles from net-like bagging one used in Paris (6)
I believe the answer is:
lunacy
'loss of marbles' is the definition.
'net-like bagging one used in paris' is the wordplay.
'net-like' becomes 'lacy'.
'bagging' means one lot of letters goes inside another (I've seen this in other clues).
'one used in paris' becomes 'un' ('one' in French).
'lacy' enclosing 'un' is 'LUNACY'.
'from' is the link.
(Other definitions for lunacy that I've seen before include "Extreme folly, insanity" , "Craziness, madness" , "Madness, insanity" , "idiotic act" , "Foolishness" .)