Clue: Drink flat white after sustaining losses on both fronts (5)
Answer: LATTE
Explanation: Definition: Drink
(f)**LAT** + (whi)**TE** [*after sustaining losses on both fronts*] 
 
 
*If I have parsed this correctly, then I don't like the clue, as it is asking the solver to remove different numbers of letters from each source word without any indication of how many letters, which is not fair on the solver.