Informed that treadle is out of order (7)
I believe the answer is:
alerted
'informed' is the definition.
The definition and answer can be both to do with communicating as well as being past participle verbs.
Maybe there's an association between them I don't understand?
'treadle is out of order' is the wordplay.
'is out of order' indicates anagramming the letters.
'treadle' is an anagram of 'ALERTED'.
'that' is the link.
Can you help me to learn more?
(Other definitions for alerted that I've seen before include "Altered, having been put on guard" , "Put on guard, forewarned" , "Warned or aroused to a sense of danger" , "Given signal" , "Put on guard, warned" .)