Chose poor alternative in possibilities for the future (9)
I believe the answer is:
horoscope
'possibilities for the future' is the definition.
(horoscopes supposedly predict the future)
'chose poor alternative' is the wordplay.
'alternative' is an anagram indicator (an alternative ordering of the letters).
'chose'+'poor'='chosepoor'
'chosepoor' with letters rearranged gives 'HOROSCOPE'.
'in' acts as a link.
(Other definitions for horoscope that I've seen before include "Forecast of a person's future based on the heavens" , "An astrological forecast" , "Forecast of fortune" , "Stars" , "Astrologer's prediction" .)