Announcing first log is the best ever (6-8)
I believe the answer is:
record-breaking
'the best ever' is the definition.
(I've seen this before)
'announcing first log' is the wordplay.
'announcing' becomes 'breaking' (I can't explain this - if you can you should give a lot more credence to this answer).
'first' is a charade indicator (letters next to each other).
'log' becomes 'record' (I've seen this before).
'breaking' after 'record' is 'RECORD-BREAKING'.
'is' is the link.
Can you help me to learn more?
(Other definitions for record-breaking that I've seen before include "Surpassing previous maximum achievement" , "setting a new standard" .)