European seen after appeals showing delight (6)
I believe the answer is:
please
'delight' is the definition.
(synonyms)
'european seen after appeals' is the wordplay.
'european' becomes 'e' (abbreviation e.g. EU).
'seen after' means one lot of letters go next to another.
'appeals' becomes 'pleas' (plea is a kind of appeal).
'e' put after 'pleas' is 'PLEASE'.
'showing' is the link.
(Other definitions for please that I've seen before include "Satisfy or gratify" , "It's said to help" , "Make happy or glad" , "Make cheerful" , "Asleep (anag)" .)