Flowery lady starts languishing (6)
I believe the answer is:
floral
'flowery' is the definition.
(thesaurus)
'lady starts languishing' is the wordplay.
'lady' becomes 'flora' (**).
'starts' indicates taking the first letters.
The first letter of 'languishing' is 'l'.
'flora'+'l'='FLORAL'
(Other definitions for floral that I've seen before include "All for (anag)" , "Such tributes" , "sort of arrangement" , "with pretty plants?" , "of a Roman goddess" .)