Charge for altering test run (7)
I believe the answer is:
entrust
'charge' is the definition.
(as in entrusting or charging someone with a task)
'altering test run' is the wordplay.
'altering' indicates an anagram.
'test'+'run'='testrun'
'testrun' with letters rearranged gives 'ENTRUST'.
'for' is the link.
(Other definitions for entrust that I've seen before include "Commend" , "Confide" , "Put something into another's care" , "Assign (a responsibility to someone)" , "Invest, commit" .)