Shunned by all after taking Friday off — this is ongoing (7)
I believe the answer is:
endless
'off this is ongoing' is the definition.
'endless' can be an answer for 'is ongoing' (that which has not ended). I'm not sure about the remainder of the definition.
'shunned by all after taking friday' is the wordplay.
'shunned by all' becomes 'friendless' (with no friends).
'after taking' indicates named letters should be taken away.
'friday' becomes 'Fri' (synonyms).
'friendless' with 'fri' taken out is 'ENDLESS'.
Can you help me to learn more?
(Other definitions for endless that I've seen before include "Potentially boring" , "Sister of Aaron (Exodus)" , "'Eternal, perpetual (7)'" , "Infinite, perpetual" , "'Eternal, without finish (7)'" .)