Editor is disheartened by blustering rhetoric that seems wayward (6)
I believe the answer is:
errant
'wayward' is the definition.
(I've seen this before)
'editor is disheartened by blustering rhetoric' is the wordplay.
'is disheartened' suggests removing the centre (the middle or heart is removed).
'by' says to put letters next to each other.
'blustering rhetoric' becomes 'rant' (rant is a kind of rhetoric. I am not sure about the 'blustering' bit.).
'editor' with its middle taken out is 'er'.
'er'+'rant'='ERRANT'
'that seems' is the link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for errant that I've seen before include "looking for adventure" , "Nomadic" , "Behaving badly" , "heretical?" , "so some knights are called" .)