Eggs on desperado finally roped in (3)
I believe the answer is:
roe
'eggs' is the definition.
(I've seen this in other clues)
'on desperado finally roped in' is the wordplay.
'on' becomes 're' ('on' can be mean 'with reference to').
'finally' says to take the final letters.
'roped in' means one lot of letters goes inside another.
The final letter of 'desperado' is 'o'.
're' going around 'o' is 'ROE'.
(Other definitions for roe that I've seen before include "shy animal" , "Part of fish, sounds like go through water" , "Lobster's ripe ovary" , "Hoofed animal(s)" , "Swift runner" .)