It's bound to be geographical (5)
I believe the answer is:
atlas
'be geographical' is the definition.
I can't tell whether this defines the answer.
'it's bound to' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'bound' means one lot of letters goes inside another.
'to' becomes 'alas' (I can't explain this - if you can you should believe this answer much more).
't' placed within 'alas' is 'ATLAS'.
Can you help me to learn more?
(Other definitions for atlas that I've seen before include "Set of charts" , "Sky carrier - map book" , "Titan who held up the sky" , "Titan - map book" , "Sky-toting Titan" .)