Go into drama as somewhat unexpected helper (4,9)

I believe the answer is:

good samaritan

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

'helper' is the definition.
(good Samaritan is a kind of helper)

'go into drama as somewhat unexpected' is the wordplay.
'go into drama as' can be anagrammed to 'GOOD SAMARITAN'.
But, I'm unsure how this is indicated.

Can you help me to learn more?

(Other definitions for good samaritan that I've seen before include "altruist" , "helpful fellow" , "helpful type" , "Biblical character" , "One kindly rescuing" .)

I've seen this clue in The Irish Independent.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.