It's bound to contain geographical information (5)
I believe the answer is:
atlas
'geographical information' is the definition.
The definition and answer can be both related to communication as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'it's bound to contain' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'bound' is an insertion indicator.
'to contain' becomes 'alas' (I can't justify this - if you can you should give a lot more credence to this answer).
't' going within 'alas' is 'ATLAS'.
Can you help me to learn more?
(Other definitions for atlas that I've seen before include "Book of maps or charts" , "It appears at the top of the spine" , "One greatly burdened" , "Map collection" , "Supporter of the classics" .)