Peculiar talent in EU officer (10)
I believe the answer is:
lieutenant
'officer' is the definition.
(lieutenant is a kind of officer)
'peculiar talent in eu' is the wordplay.
'peculiar' is an anagram indicator (I've seen this in other clues).
'talent'+'in'+'eu'='talentineu'
'talentineu' is an anagram of 'LIEUTENANT'.
(Other definitions for lieutenant that I've seen before include "Military rank" , "UK rank below captain" , "e.g. one on French side who had a woman?" , "Deputy" , "Army officer" .)