Salty little fish (7)
I believe the answer is:
anchovy
'salty little fish' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for anchovy that I've seen before include "Brit often found pickled" , "Small salty fish" , "Small fish, may be served with toast." , "Small edible fish" , "Strong-flavoured fish" .)