Getting European ace to reach out is a pain (7)
I believe the answer is:
earache
'pain' is the definition.
(earache is a kind of pain)
'getting european ace to reach out' is the wordplay.
'getting' is a charade indicator (letters next to each other).
'european' becomes 'e' (abbreviation e.g. EU).
'ace' becomes 'a'.
'to' means one lot of letters go next to another (I've seen this in other clues).
'out' is an anagram indicator (out can mean wrong or inaccurate).
'a' put after 'reach' is 'reacha'.
'reacha' with letters rearranged gives 'earach'.
'e' put after 'earach' is 'EARACHE'.
'is a' is the link.
(Other definitions for earache that I've seen before include "Pain inside the head" , "Aural complaint" , "Form of torture" , "complaint to The Listener" , "a problem for some listeners" .)