Book of verse, indeed, just opened by idiot (6,4)
I believe the answer is:
vanity fair
'book' is the definition.
(I've seen this before)
'verse indeed just opened by idiot' is the wordplay.
'verse' becomes 'v'.
'indeed' becomes 'ay' ('ay' and 'aye' can mean yes).
'just' becomes 'fair' (just can mean fair in the sense of showing justice).
'opened by' indicates putting letters inside (some letters open a gap in others).
'idiot' becomes 'nit' (nit can mean a stupid person).
'ay'+'fair'='ayfair'
'ayfair' going around 'nit' is 'anityfair'.
'v'+'anityfair'='VANITY FAIR'
'of' acts as a link.
(Other definitions for vanity fair that I've seen before include "Novel by Thackeray" , "Book by Thackeray" , "place visited by Christian" , "market pilgrim progressed through" , "Sharp tale" .)