Definition: "dramatist"

This is a container clue combined with an anagram - look for an indicator word suggesting rearrangement, plus one word going inside or around another.

'Unconventional' signals an anagram of 'centre', and this anagram needs to go around or contain the single letter E (European).

Answer: TERENCE | 'Unconventional' indicates an anagram of CENTRE, which goes around E (European), giving us TER(E)NCE = TERENCE (Roman dramatist)