Small, but maybe of some prominence? (5)
I believe the answer is:
minor
'small' is the definition.
(synonyms)
'maybe of some prominence?' is the wordplay.
'of some' suggests taking the first letters (I've seen 'some' mean this).
'prominence?' becomes 'inor' (I can't justify this - if you can you should give a lot more credence to this answer).
The first letter of 'maybe' is 'm'.
'm'+'inor'='MINOR'
'but' acts as a link.
Can you help me to learn more?
(Other definitions for minor that I've seen before include "Under-age or of little importance" , "One hasn't reached legal majority" , "Insignificant" , "Trivial" , "Smaller - child" .)