Suffer to be productive (4)
I believe the answer is:
bear
I believe this clue is a double definition.
'suffer' is the first definition.
(synonyms)
'to be productive' is the second definition.
(as in bearing children)
(Other definitions for bear that I've seen before include "Support (a weight)" , "Situation where there are more sellers than willing buyers" , "grizzly, perhaps?" , "Ursine - carry" , "Large carnivore" .)