Amateur, not English, could show pain (6)

I believe the answer is:

trauma

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

'pain' is the definition.
(trauma can mean pain or distress)

I cannot understand how the rest of the clue works.

(Other definitions for trauma that I've seen before include "Shock with long-lasting effects" , "hurt" , "Bodily or mental shock" , "Emotional shock, long-lasting" , "Physical injury (medical)" .)

I've seen this clue in The Sun.

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