Stayed with us erratically, coming once a week (8)
I believe the answer is:
tuesdays
'once a week' is the definition.
I can't tell whether this defines the answer.
'stayed with us erratically' is the wordplay.
'with' is a charade indicator (letters next to each other).
'erratically' indicates an anagram.
'stayed' put after 'us' is 'usstayed'.
'usstayed' is an anagram of 'TUESDAYS'.
'coming' acts as a link.
Can you help me to learn more?
(Other definitions for tuesdays that I've seen before include "Nautical jacket" , "24-hour periods?" , "''... child is full of grace'' (7'1)" , "Weekdays steady us" .)