With energy run out, longs for a bit of Chinese food (6,4)
I believe the answer is:
spring roll
'a bit of chinese food' is the definition.
(I know that Spring roll is a type of Chinese cuisine)
'with energy run out longs' is the wordplay.
'with' means one lot of letters go next to another.
'energy' becomes 'spring' (as in having a spring in one's step).
'run out' becomes 'RO' (cricket abbreviation).
'longs' becomes 'll' (an abbreviation for long written twice).
'spring' next to 'ro' is 'springro'.
'springro'+'ll'='SPRING ROLL'
'for' is the link.
(Other definitions for spring roll that I've seen before include "Portion of Chinese food" , "Chinese pancake" , "dish from China" , "Chinese snack" , "Gloucestershire event?" .)