Unprofessional team at EU? Rishi's selection (10)

I believe the answer is:

amateurish

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

'unprofessional' is the definition.
(synonyms)

'team at eu? rishi's selection' is the wordplay.
'AMATEURISH' is hidden in amongst the letters.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for amateurish that I've seen before include "incompetent" , "using little craft, perhaps" , "Unprofessional" , "Lay" , "done imperfectly" .)

I've seen this clue in The Independent.

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