Done regularly and repeatedly (8)
I believe the answer is:
habitual
'done regularly and repeatedly' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for habitual that I've seen before include "Done regularly and repeatedly" , "Commonly practised" , "A halibut? (anag)" , "Like a routine" , "Done constantly by a halibut" .)