### Clue: 2 team expanded to restrict heat and carbon (6,4)
### Answer: GROUND CREW 
 ### Explanation: Definition: 2 team
 GREW(expanded/became larger) **containing**(to restrict) [ ROUND(a heat/ in a competition to determine who goes into the next stage) **plus**() C(symbol for the chemical element, carbon).
Defn: Airport(solution to 2 down) team, which takes care of one aspect of operations on the ground.