Commentator's let out measures at any rate (9)
I believe the answer is:
leastways
'at any rate' is the definition.
(synonyms)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for leastways that I've seen before include "in any event" , "If nothing else" , "As a minimum" , "at any rate" , "anyhow" .)