Fish in horrid drains eaten for starter? (7)
I believe the answer is:
'fish' is the definition.
(I know that sardine is a type of fish)
'horrid drains eaten for starter?' is the wordplay.
'horrid' indicates an anagram.
'for starter?' suggests taking the first letters (I've seen 'for starters' mean this).
The first letter of 'eaten' is 'e'.
'drains' with letters rearranged gives 'sardin'.
'in' is the link.
(Other definitions for sardine that I've seen before include "Fish in tin?" , "Small fish, usually canned" , "Swimmer" , "Young pilchard" , "Fish (often tinned)" .)