It moves people, in a small way (7)
I believe the answer is:
'it moves' is the definition.
The definition suggests a singular noun which matches the answer.
'people in a small way' is the wordplay.
'people' becomes 'bu' (I can't explain this - if you can you should believe this answer much more).
'in' means one lot of letters goes inside another.
'a small' becomes 'mini' (short for miniature).
'way' becomes 's' (Compass direction - South).
'bu' inserted inside 'minis' is 'MINIBUS'.
Can you help me to learn more?
(Other definitions for minibus that I've seen before include "transport for children?" , "Small multi-seater vehicle" , "Small coach" , "Vehicle for up to, say, 15 passengers" , "form of transport" .)