Crossword Genius

Slight strains in race? Go to Casualty creating a racket! (9)

Ross

I believe the answer is:

trickster

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

'a racket' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'slight strains in race? go to casualty' is the wordplay.
I cannot really understand how this works, but
'strains' could be 'ricks' and 'ricks' is located in the answer.
'race?' could be 'tt' and 'tt' is located in the leftover letters.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'creating' is the link.

Can you help me to learn more?

(Other definitions for trickster that I've seen before include "Practical joker" , "Cheater, deceiver" , "Loki, say" , "Hoaxer" , "Cheat, deceiver" .)

I've seen this clue in the Irish Times.
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