Crossword Genius

Apprentice from Aintree messed up (7)

Ross

I believe the answer is:

trainee

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

'apprentice' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for trainee that I've seen before include "One learning a job" , "encountered bad weather in driving area" , "Aintree (anag.)" , "New recruit" , "Person under instruction" .)

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