Was informed by one article in a group (5)
I believe the answer is:
heard
'was informed' is the definition.
(I've seen this in another clue)
'one article in a group' is the wordplay.
I cannot really understand how this works, but
'one' could be 'a' (a thing is one thing) and 'a' is present in the answer.
The remaining letters 'herd' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'by' is the link.
Can you help me to learn more?
(Other definitions for heard that I've seen before include "Got to know (of)" , "Caught - picked up" , "Picked up by the ears?" , "Tried" , "Traditional children shouldn't be" .)