Sarah, in present times, serves it cold (5)
I believe the answer is:
salad
'times serves it cold' is the definition.
I can't judge whether this definition defines the answer.
'sarah in present' is the wordplay.
'sarah' becomes 'Sal' (Sally is a common pet form of Sarah).
'in present' becomes 'ad' (AD, Anno Domini, as opposed to BC, Before Christ. I am not sure about the 'in' bit.).
'sal'+'ad'='SALAD'
Can you help me to learn more?
(Other definitions for salad that I've seen before include "vegetarian dish" , "Cold dish of various vegetables," , "Cold dish of vegetables or fruits" , "A cold meal with lots of lettuce" , "Raw, green, veg" .)