Volume: a pretty tiny novel within a novel (6,4)
I believe the answer is:
vanity fair
'a novel' is the definition.
(I've seen this before)
'volume a pretty tiny novel within' is the wordplay.
'volume' becomes 'v'.
'pretty' becomes 'fair' (I've seen this before).
'novel' is an anagram indicator.
'within' is an insertion indicator.
'tiny' with letters rearranged gives 'nity'.
'a'+'fair'='afair'
'afair' placed around 'nity' is 'anityfair'.
'v'+'anityfair'='VANITY FAIR'
(Other definitions for vanity fair that I've seen before include "Novel by Thackeray" , "place visited by Christian" , "market pilgrim progressed through" , "Sharp tale" , "Book by Thackeray" .)