Black plant for wealthy globetrotters? (3,3)
I believe the answer is:
jet set
'wealthy globetrotters?' is the definition.
(I've seen this before)
'black plant' is the wordplay.
'black' becomes 'jet' ('jet' can be similar in meaning to 'black').
'plant' becomes 'set'.
'jet'+'set'='JET SET'
'for' is the link.
(Other definitions for jet set that I've seen before include "International crowd" , "Rich crowd of fast fliers" , "trendy travellers" , "Rich people who fly about a lot" , "Moneyed crowd who travel in fast planes" .)