Large roses ordered for beaten contestants (6)
I believe the answer is:
losers
'beaten contestants' is the definition.
(people who lost)
'large roses ordered' is the wordplay.
'large' becomes 'l' (eg in clothes sizes).
'ordered' indicates anagramming the letters.
'roses' anagrammed gives 'osers'.
'l'+'osers'='LOSERS'
'for' is the link.
(Other definitions for losers that I've seen before include "Odd sorels never win" , "Also-rans" , "Odd sorels don't win" , "They're unsuccessful" , "They're defeated" .)