Ran away from upset pixie on date (4)
I believe the answer is:
fled
'ran away from' is the definition.
(I've seen this before)
'upset pixie on date' is the wordplay.
'upset' is a reversal indicator.
'pixie' becomes 'elf' (synonyms).
'on' is a charade indicator (letters next to each other).
'date' becomes 'd' (common abbreviation eg in DOB, date of birth).
'elf' written backwards gives 'fle'.
'fle'+'d'='FLED'
(Other definitions for fled that I've seen before include "Ran off in a hurry" , "Left the field" , "Having run or hurried away" , "Did a runner" , "Female showed the way and escaped" .)