They help people grow better (5,7)
I believe the answer is:
green fingers
'they' is the definition.
Both the definition and answer are plural nouns.
Perhaps they are linked in a way I don't understand?
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for green fingers that I've seen before include "Ability for horticulture" , "Gardener's asset" , "Natural ability as a gardener" , "Person adept at growing plants" , "Horticultural knack" .)