Lens produced for my lass if nagging, possibly (10,5)
I believe the answer is:
magnifying glass
'lens' is the definition.
(thesaurus)
'my lass if nagging possibly' is the wordplay.
'possibly' is an anagram indicator.
'my'+'lass'+'if'+'nagging'='mylassifnagging'
'mylassifnagging' is an anagram of 'MAGNIFYING GLASS'.
'produced for' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for magnifying glass that I've seen before include "that can cause you to see double!" , "It helps to read fine print" .)