Failed to reveal some fresh ideas (3)
I believe the answer is:
hid
'failed' is the definition.
The definition and answer can be both related to change as well as being past participle verbs.
Perhaps there's an association between them I don't understand?
'some fresh ideas' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'HID' is hidden within 'fresh ideas'.
'to reveal' acts as a link.
Can you help me to learn more?
(Other definitions for hid that I've seen before include "Concealed, kept secret" , "Concealed (oneself?)" , "Concealed from sight" , "Took cover" , "Stayed out of sight" .)