Small deer (3)
'small deer' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for roe that I've seen before include "shy animal" , "If hard, eggs" , "Part of fish, sounds like go through water" , "Hoofed animal(s)" , "eg Caviare" .)
(Other definitions for roebuck that I've seen before include "Stag" , "Type of male deer" , "Providing venison" , "does partner" , "Being wild" .)