It's bound to contain maps (5)
I believe the answer is:
atlas
'maps' is the definition.
(printed collection of maps)
'it's bound to contain' is the wordplay.
'it' becomes ''t' (abbreviation. e.g. in 'tis).
'bound' indicates putting letters inside.
'to contain' becomes 'alas' (I am not sure about this - if you are sure you should believe this answer much more).
't' put within 'alas' is 'ATLAS'.
Can you help me to learn more?
(Other definitions for atlas that I've seen before include "Legendary weightlifter" , "Titan who supported the heavens" , "Size of paper once" , "Its architectural name is telamon" , "African mountain range" .)