It’s bound to have maps in (5)
I believe the answer is:
atlas
'maps in' is the definition.
'atlas' can be an answer for 'maps' (printed collection of maps). I'm not certain of the 'in' bit.
'it's bound to' is the wordplay.
'it' becomes 't' (abbreviation. e.g. in 'tis).
'bound' indicates putting letters inside.
'to' becomes 'alas' (I can't explain this - if you can you should believe this answer much more).
't' inserted into 'alas' is 'ATLAS'.
'have' is the link.
Can you help me to learn more?
(Other definitions for atlas that I've seen before include "Supporter of the classics" , "Ballistic missile" , "Legendary weightlifter" , "Chart book" , "Collection of maps" .)