Eggs are dear say (3)
I believe the answer is:
roe
'eggs' is the definition.
(fish eggs)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for roe that I've seen before include "Caviar" , "Mass of fish eggs" , "Swift runner" , "Part of fish, sounds like go through water" , "If hard, eggs" .)