See following summary exactly (9)
I believe the answer is:
precisely
'exactly' is the definition.
(I know that exactly can be written as precisely)
'see following summary' is the wordplay.
'see' becomes 'ely' (see is a place with a cathedral - e.g. Ely).
'following' says to put letters next to each other.
'summary' becomes 'precis' (precis is a kind of summary).
'ely' put after 'precis' is 'PRECISELY'.
(Other definitions for precisely that I've seen before include "Accurately, exactly" , "Exactly, without vagueness" , "without a doubt" .)