Meet order to be abundant (4)
I believe the answer is:
teem
'be abundant' is the definition.
(I've seen this in another clue)
'meet order' is the wordplay.
'order' indicates an anagram.
'meet' is an anagram of 'TEEM'.
'to' is the link.
(Other definitions for teem that I've seen before include "Abound - pour" , "Bucket down" , "Pullulate" , "pelt" , "Be prolific" .)