1960s model ignoring fashion for seafood (6)
I believe the answer is:
shrimp
'for seafood' is the definition.
(shrimp is a kind of seafood)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for shrimp that I've seen before include "Diminutive person" , "no giant" , "Runt" , "ingredient of cocktail" , "very small one" .)