Hard to make out behind replica designed by European (14)

I believe the answer is:

indecipherable

'hard to make out' is the definition.

'behind replica designed by european' is the wordplay.
'designed' indicates an anagram (designed with the letters).
'by' says to put letters next to each other.
'european' becomes 'e' (abbreviation e.g. EU).
'behind'+'replica'='behindreplica'
'behindreplica' is an anagram of 'indecipherabl'.
'indecipherabl'+'e'='INDECIPHERABLE'

(Another definition for indecipherable that I've seen is " not good for readers".)

I've seen this clue in The Guardian.

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