Letter tiles thrown out after Scrabble championship finally? (7)
I believe the answer is:
epistle
'letter' is the definition.
(epistle is a kind of letter)
'tiles thrown out after scrabble championship finally?' is the wordplay.
'thrown out' indicates anagramming the letters.
'after' means one lot of letters go next to another.
'finally?' indicates one should take the final letters (I've seen 'finally' mean this).
The last letters of 'scrabble championship' are 'ep'.
'tiles' is an anagram of 'istle'.
'istle' after 'ep' is 'EPISTLE'.
(Other definitions for epistle that I've seen before include "screed" , "Such as St Paul wrote" , "Letter from a saint" , "Long formal letter (found in the New Testament?)" , "a for instance" .)