Transport meal around - that's sweet (7)
I believe the answer is:
caramel
'that's sweet' is the definition.
(caramel is a kind of sweet)
'transport meal around' is the wordplay.
'transport' becomes 'car' (car is a kind of transport).
'around' indicates anagramming the letters.
'meal' with letters rearranged gives 'amel'.
'car'+'amel'='CARAMEL'
(Other definitions for caramel that I've seen before include "Sugar solution heated till brown" , "Chew candy" , "Chewy sweet - burnt sugar" , "Toffee-like sweet" , "Browned syrup" .)