Garland of little irises in part (3)
I believe the answer is:
lei
'garland' is the definition.
(I know that garland can be written as lei)
'of little irises in part' is the wordplay.
'in part' indicates a hidden word.
'LEI' is hidden within 'of little irises'.
(Other definitions for lei that I've seen before include "neck decoration" , "Flower arrangements" , "Hawaiin flower garland" , "Flowers worn round the neck" , "Honolulu chain of flowers" .)