Speech has been translated first - that's a blessing (11)
I believe the answer is:
benediction
'that's a blessing' is the definition.
(synonyms)
'speech has been translated first' is the wordplay.
I cannot quite understand how this works, but
'speech' could be 'diction' (I've seen this before) and 'diction' is located in the answer.
an anagram of 'been' is 'bene' which is within the answer.
No letters remain.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for benediction that I've seen is " prayer".)