Was abundant (6)
I believe the answer is:
teemed
'was abundant' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for teemed that I've seen before include "(Of rain) poured down" , "Swarmed - abounded" , "Rained heavily" , "Swarmed, was very plentiful" , "Was full of, swarmed" .)