Eat some sardines (4)
I believe the answer is:
dine
'eat' is the definition.
(to dine is to eat a meal)
'some sardines' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'DINE' is hidden within 'sardines'.
(Other definitions for dine that I've seen before include "Have an evening meal" , "Have supper" , "Feed" , "Take meal" , "Eat dinner" .)