Select English, low in calories (5)
I believe the answer is:
elite
'select' is the definition.
(I've seen this before)
'english low in calories' is the wordplay.
'english' becomes 'E' (abbreviation).
'low in calories' becomes 'lite' (light in calories, calorie-lite).
'e'+'lite'='ELITE'
(Other definitions for elite that I've seen before include "A privileged class of people" , "Privileged or posh group" , "A privileged group in society" , "Pick of the bunch" , "one of the letter sizes" .)