It's not a different base for commuters (7)
I believe the answer is:
station
'base for commuters' is the definition.
'station' can be an answer for 'base' (synonyms). I'm not sure about the 'for commuters' bit.
'it's not a different' is the wordplay.
'different' is an anagram indicator (letters placed in a different order).
'its'+'not'+'a'='itsnota'
'itsnota' with letters rearranged gives 'STATION'.
Can you help me to learn more?
(Other definitions for station that I've seen before include "Place of duty, work" , "Broadcasting channel" , "HQ - stopping place - post" , "Train halt" , "Depot" .)