Cooks throw tea into it to make trouble! (3,5)
I believe the answer is:
hot water
'into it to make trouble' is the definition.
(being hot water is being in trouble)
'cooks throw tea' is the wordplay.
'cooks' indicates an anagram.
'throw'+'tea'='throwtea'
'throwtea' anagrammed gives 'HOT WATER'.
(Other definitions for hot water that I've seen before include "Difficulty" , "Kind of trouble, could be scalding" , "Distressing plight to be in" , "Bed warmer" , "(Wet?) trouble" .)