Warned of related changes (7)
I believe the answer is:
alerted
'warned' is the definition.
(alerting is a kind of warning)
'related changes' is the wordplay.
'changes' indicates anagramming the letters.
'related' with letters rearranged gives 'ALERTED'.
'of' is the link.
(Other definitions for alerted that I've seen before include "Warned or aroused to a sense of danger" , "Given warning" , "Given signal" , "Altered, having been put on guard" , "Put on guard, raised the alarm" .)