Eggs in a line picked up? (3)
I believe the answer is:
roe
'eggs' is the definition.
(I've seen this in other clues)
'a line picked up?' is the wordplay.
'a line' becomes 'row' (row is a kind of line).
'picked up?' indicates a 'sounds like' (homophone) clue (I've seen 'picked up' mean this).
'row' sounds like 'ROE'.
'in' acts as a link.
(Other definitions for roe that I've seen before include "Caviar" , "Part of fish, sounds like go through water" , "If hard, eggs" , "Hoofed animal(s)" , "Lobster's ripe ovary" .)