Little fish: unimportant people (5,3)
I believe the answer is:
small fry
This clue is a double definition.
'little fish' is the first definition.
(I've seen this before)
'unimportant people' is the second definition.
(I've seen this before)
(Other definitions for small fry that I've seen before include "Insignificant people" , "people of little importance" , "Tiddlers - trifling things" , "Young fish" , "Little fish - trivial things" .)