Alongside being a radio presenter, is expert with books (8)
I believe the answer is:
adjacent
'alongside' is the definition.
(I've seen this before)
'a radio presenter is expert with books' is the wordplay.
'radio presenter' becomes 'dj'.
'is expert' becomes 'ace' (I've seen this before).
'with' says to put letters next to each other.
'books' becomes 'nt' (abbreviation for New Testament).
'a'+'dj'+'ace'+'nt'='ADJACENT'
'being' is the link.
(Other definitions for adjacent that I've seen before include "Lying near or next (to)" , "cheek by jowl" , "Alongside" , "Lying near, bordering" , "Contiguous" .)