Bungling fashionable European taking exercise (5)
I believe the answer is:
inept
'bungling' is the definition.
(synonyms)
'fashionable european taking exercise' is the wordplay.
'fashionable' becomes 'in' (in can mean fashionable or trendy).
'european' becomes 'e' (abbreviation e.g. EU).
'taking' is a charade indicator (letters next to each other).
'exercise' becomes 'PT' (abbreviation for physical training).
'in'+'e'+'pt'='INEPT'
(Other definitions for inept that I've seen before include "Ham-fisted" , "pointless" , "Wanting" , "Silly - unskilled - unsuitable" , "Clumsy, bungling" .)