Rue raising sample of winter geraniums (6)
I believe the answer is:
regret
'rue' is the definition.
(I know that rue can be written as regret)
'raising sample of winter geraniums' is the wordplay.
'raising' says the letters should be written in reverse.
'sample of' says the answer is hidden in the clue (an extract or sample of the clue).
'terger' is hidden in the letters of 'winter geraniums'.
'terger' backwards is 'REGRET'.
(Other definitions for regret that I've seen before include "Feel sorry about" , "Feeling or repentance or sorrow" , "Contrition" , "Bad feeling" , "Rue - remorse" .)