Some endlessly rolling on river current? (7)
I believe the answer is:
eskimos
'some endlessly rolling on river current?' is the definition.
Although both the answer and 'current?' are nouns, they are not in the same form of the noun.
'some endlessly rolling on river current?' is the wordplay.
'endlessly' means to remove the last letter.
'rolling' is a reversal indicator.
'on' is a charade indicator (letters next to each other).
'river' becomes 'esk' (I can't explain this - if you can you should give a lot more credence to this answer).
'current?' becomes 'I' (symbol for electric current).
'some' with its final letter removed is 'som'.
'som' backwards is 'mos'.
'esk'+'i'='eski'
'mos' put after 'eski' is 'ESKIMOS'.
Can you help me to learn more?
(Other definitions for eskimos that I've seen before include "They live in igloos" , "The Inuit people" , "People inhabiting the Arctic region" , "Is smoke made by Artic people ?" , "Igloo dwellers" .)