Whole of Ireland absorbing part of the Bible (6)
I believe the answer is:
entire
'whole' is the definition.
(similar in meaning)
'ireland absorbing part of the bible' is the wordplay.
'ireland' becomes 'eire' (poetic name for Ireland).
'absorbing' indicates putting letters inside.
'part of the bible' becomes 'nt' (New Testament).
'eire' enclosing 'nt' is 'ENTIRE'.
'of' is the link.
(Other definitions for entire that I've seen before include "outright" , "Whole and complete" , "excluding nothing" , "Complete, intact" , "Unmitigated" .)