Rue de Pierre Gretzky (6)
I believe the answer is:
regret
'rue' is the definition.
(synonyms)
'de pierre gretzky' is the wordplay.
'de' indicates the answer is hidden within the clue ('of' in French - letters come out of the clue).
'REGRET' is hidden in the letters of 'pierre gretzky'.
(Other definitions for regret that I've seen before include "Be sorry for, wish it hadn't happened" , "Sorrow for something done" , "Compunction" , "Mourn" , "Feel sad or disappointed about" .)