Group of people of some obscure origins have base in large town... (7)
I believe the answer is:
society
'group of people' is the definition.
'society' can be an answer for 'group' (thesaurus). I'm not sure about the 'of people' bit.
'some obscure origins have base in large town' is the wordplay.
'origins' indicates taking the first letters.
'have' says to put letters next to each other.
'base' becomes 'e' (Euler's number - base of natural logarithms).
'in' indicates putting letters inside.
'large town' becomes 'city' (I've seen this before).
The first letters of 'some obscure' is 'so'.
'e' inserted into 'city' is 'ciety'.
'so'+'ciety'='SOCIETY'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for society that I've seen before include "Community - group" , "Fellowship; company" , "Culture - association" , "Fellowship; fashionable world" , "Companionship; association" .)