The most common and most likely answer to this crossword clue is the 9 letter word PARAMEDIC
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More clues leading to the result PARAMEDIC
Buddy explains!

The straight part
We know that "Emergency helper" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case emergency helper = paramedic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PARAMEDIC mean?
PARAMEDIC noun- An individual trained to medically stabilize people through various interventions, victims of trauma or medical events outside of a hospital setting and preparing them for transport to a medical facility.
- An individual who is licensed at the state or national level to practice medical interventions in an emergency pre-hospital setting.