Tropical creeper (7)
'tropical creeper' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for liana that I've seen before include "Woody climbing (usually tropical) plant" , "Climbing-plant" , "Woody climbing tropical plant -- a nail (anag)" , "Rainforest climber" , "Jungle climber" .)
(Another definition for lantana that I've seen is " Plant".)