Plant found in Beijing or Seoul (5)
I believe the answer is:
gorse
'plant' is the definition.
The answer is an example.
'in beijing or seoul' is the wordplay.
'in' indicates the answer is hidden within the clue.
'GORSE' is hidden within 'beijing or seoul'.
'found' acts as a link.
(Other definitions for gorse that I've seen before include "Spiny yellow-flowered shrub" , "Spiny heathland shrub" , "Ogres (anag.)" , "I'm always blooming" , "Spiky shrub" .)