The archer got up sore (4)
I believe the answer is:
eros
'the archer' is the definition.
(I've seen this before)
'up sore' is the wordplay.
'up' says the letters should be written backwards (in down clue: letters go upwards).
'sore' reversed gives 'EROS'.
'got' acts as a link.
(Other definitions for eros that I've seen before include "Greek god of sexual love, Cupid to the Romans" , "Asteroid - Greek god of love" , "In Greek myth, the god of love" , "Group of instincts" , "Form of love" .)