Tips for raw oysters, even caviar? (3)
I believe the answer is:
roe
'caviar?' is the definition.
(fish eggs)
'tips for raw oysters even' is the wordplay.
'tips for' says to take the initial letters (letters at the tips of the words).
The initial letters of 'raw oysters even' is 'ROE'.
(Other definitions for roe that I've seen before include "Mass of fish's eggs" , "A mass of fish-eggs" , "Swift runner" , "Hoofed animal(s)" , "If hard, eggs" .)