Flexible story covering rise in growth (not complex) (7)
I believe the answer is:
lissome
'flexible' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for lissome that I've seen before include "Oil mess (anag)" , "flexible" , "Thin - supple - graceful" , "Willowy" , "pliable" .)