Traveller's joy: bar, and models cavorting (3,4,5)
I believe the answer is:
old mans beard
'traveller's joy' is the definition.
(synonyms)
'bar and models cavorting' is the wordplay.
'cavorting' is an anagram indicator.
'bar'+'and'+'models'='barandmodels'
'barandmodels' anagrammed gives 'OLD MANS BEARD'.
(Other definitions for old mans beard that I've seen before include "Spanish moss - traveller's joy - bad red salmon (anag)" , "that grows up fast" , "growth on dad?" , "Climbing plant" , "Wild clematis" .)