Ginger and exotic plant cultivation (9)
I believe the answer is:
gardening
'plant cultivation' is the definition.
(gardening is cultivating plants)
'ginger and exotic' is the wordplay.
'exotic' is an anagram indicator (an unusual form of the letters).
'ginger'+'and'='gingerand'
'gingerand' with letters rearranged gives 'GARDENING'.
(Other definitions for gardening that I've seen before include "Tending plants" , "which makes you increasingly cultivated?" , "See 1" , "Hobby" , "Deranging with green-fingered work" .)