Burdensome enough to make anybody turn sour (7)

I believe the answer is:
onerous
'burdensome' is the definition.
(synonyms)
'anybody turn sour' is the wordplay.
'anybody' becomes 'one' (I've seen this in another clue).
'turn' is an anagram indicator.
'sour' anagrammed gives 'rous'.
'one'+'rous'='ONEROUS'
'enough to make' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for onerous that I've seen before include "Involving much effort" , "Burdensome, taxing" , "Oppressive, difficult to bear" , "No euros? That's burdensome" , "'Burdensome, not easily borne (7)'" .)
