Books in popular eastern landing place showing discrepancy (10)
I believe the answer is:
inequality
'discrepancy' is the definition.
(thesaurus)
'books in popular eastern landing place' is the wordplay.
'books' becomes 'lit' (abbreviation for literature).
'in' is an insertion indicator.
'popular' becomes 'in' ('in' can mean trendy).
'eastern' becomes 'e'.
'landing place' becomes 'quay' (quay is a kind of landing place).
'in'+'e'+'quay'='inequay'
'lit' going inside 'inequay' is 'INEQUALITY'.
'showing' is the link.
(Another definition for inequality that I've seen is " Disparity".)