Regular street rose to these occasions (6)
I believe the answer is:
events
'these occasions' is the definition.
(I've seen this in another clue)
'regular street rose' is the wordplay.
'regular' becomes 'even' (synonyms).
'street' becomes 'st' (abbreviation).
'rose' shows that the letters should be reversed in order.
'st' written backwards gives 'ts'.
'even'+'ts'='EVENTS'
'to' is the link.
(Other definitions for events that I've seen before include "Things taking place" , "Occurences, happenings" , "Significant incidents" , "They take place" , "Episodes" .)