Small herring-like fish (5)
(Other definitions for sprat that I've seen before include "Small herring, often smoked or canned" , "little fish" , "Small edible fish" , "Small fish (used to catch mackerel?)" , "chap giving richer course material to the Dutch" .)
(Other definitions for pilchard that I've seen before include "Small fatty fish, usually tinned" , "Edible herring relative" , "Fish of herring family" , "type of fish" , "Small sea fish related to the herring" .)