Times? European, and impetuous for the most part (4)
I believe the answer is:
eras
'times?' is the definition.
(era is a kind of time)
'european and impetuous for the most part' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'and' means one lot of letters go next to another.
'impetuous' becomes 'rash' (I've seen this before).
'for the most part' means to remove the last letter.
'rash' with its last letter taken off is 'ras'.
'e'+'ras'='ERAS'
(Other definitions for eras that I've seen before include "Periods of time" , "At least two times" , "typeface" , "Epochs" , "Periods, ages" .)