Every European run mostly loaded with hidden imports? (9)
I believe the answer is:
allegoric
'with hidden imports?' is the definition.
(an allegory has hidden meaning or import)
'every european run mostly loaded' is the wordplay.
'every' becomes 'all' (similar in meaning).
'european run' becomes 'ego' (I can't justify this - if you can you should give a lot more credence to this answer).
'mostly' means to remove the last letter.
'loaded' becomes 'rich' (similar in meaning).
'rich' with its last letter taken off is 'ric'.
'all'+'ego'+'ric'='ALLEGORIC'
(Other definitions for allegoric that I've seen before include "Figurative" , "with symbolic meaning" , "serving as symbol" .)