Underground station's multiple entrances? (8)
I believe the answer is:
archways
'underground station's multiple entrances?' is the definition.
I can't judge whether this defines the answer.
'multiple entrances?' is the wordplay.
'multiple entrances?' means two replacements for 'entrance'.
'entrance' becomes 'archway' (archway is a kind of entrance).
'entrance' becomes 's' (I am not sure about this - if you are sure you should believe this answer much more).
'archway'+'s'='ARCHWAYS'
Can you help me to learn more?
(Another definition for archways that I've seen is " vaulted passages".)