Unsophisticated, though one is in the hub of things (5)
I believe the answer is:
naive
'unsophisticated' is the definition.
(synonyms)
'one is in the hub of things' is the wordplay.
'one is in the' indicates putting letters inside.
'hub' becomes 'nave' (I've seen this in another clue).
'of things' becomes 'i' (I am not sure about this - if you are sure you should believe this answer much more).
'nave' placed around 'i' is 'NAIVE'.
'though' is the link.
Can you help me to learn more?
(Other definitions for naive that I've seen before include "Rather too simple and gullible" , "Rather too simple and ingenuous" , "Natural, unaffected" , "Too credulous or trusting" , "Without worldly wisdom" .)