Negative feeling surrounding small expedition (5)
I believe the answer is:
haste
'expedition' is the definition.
(expedition is expediting, doing something quickly)
'negative feeling surrounding small' is the wordplay.
'negative feeling' becomes 'hate' (hate is a kind of feeling. I am not sure about the 'negative' bit.).
'surrounding' indicates putting letters inside.
'small' becomes 's' (abbreviation - e.g. clothes size).
'hate' placed around 's' is 'HASTE'.
Can you help me to learn more?
(Other definitions for haste that I've seen before include "''More . . . . ., less speed'' (5)" , "Hurry, urgency" , "Speed, hurry" , "Rushing (but with less speed?)" , "''Marry in . . . . ., repent at leisure''" .)