Level advanced or easy (15)

I believe the answer is:

straightforward

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

'level advanced' is the wordplay.
'level' becomes 'straight' (I am not sure about this - if you are sure you should believe this answer much more).
'advanced' becomes 'forward' (synonyms).
'straight'+'forward'='STRAIGHTFORWARD'

'or' acts as a link.

Can you help me to learn more?

(Other definitions for straightforward that I've seen before include "Easy to understand" , "Plain sailing" , "Elementary" , "Honest, open" , "That's simple" .)

I've seen this clue in The Daily Express.

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