Trauma echoes violently for non-professional (7)

I believe the answer is:

amateur

I'm a little stuck... Click here to teach me more about this clue!

'non-professional' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

(Other definitions for amateur that I've seen before include "Unpaid or unskilled" , "Dabbler" , "incompetent" , "Inept, non-professional" , "Unprofessional" .)

I've seen this clue in The Irish Times.

Want a hint initially instead of a full solution? Install my app