Snare firm with error initially made in books (6)
I believe the answer is:
cobweb
'snare' is the definition.
(thesaurus)
'firm with error initially made in books' is the wordplay.
'firm' becomes 'co' (a firm is a company).
'initially' indicates taking the first letters.
'made in' means one lot of letters goes inside another.
'books' becomes 'bb'.
The initial letters of 'with error' is 'we'.
'we' placed inside 'bb' is 'bweb'.
'co'+'bweb'='COBWEB'
(Other definitions for cobweb that I've seen before include "Dusty spider's weaving" , "Dust-covered network" , "Dust (and fly) collector" , "Spider's net" , "Fairy attendant on Bottom" .)