Speed taken by European in present condition for stress (8)
I believe the answer is:
emphasis
'for stress' is the definition.
(synonyms)
'speed taken by european in present condition' is the wordplay.
'speed' becomes 'mph' (abbreviation for miles per hour).
'taken by' says to put letters next to each other.
'european' becomes 'E' (abbreviation e.g. EU).
'in present condition' becomes 'asis' (I've seen this in another clue).
'mph' put after 'e' is 'emph'.
'emph'+'asis'='EMPHASIS'
(Other definitions for emphasis that I've seen before include "Weight" , "Importance; priority" , "Stress, accentuation" , "Stress or significance" , "Special importance or significance" .)