Plentiful, profuse (8)
I believe the answer is:
abundant
I believe this clue is a double definition.
'plentiful' is the first definition.
(similar in meaning)
'profuse' is the second definition.
(similar in meaning)
(Other definitions for abundant that I've seen before include "full" , "Existing in large amounts" , "common" , "well-provided" , "Copious, plentiful" .)