Well done, ginge. You have finally cracked the clue.
It has been bugging me for ages but I could not get further than merryphil's "main tenor" but that, to me, didn't really sound like "maintainer". Neither did it allow for the last bit of the clue - "when original record comes out" - that was the bit that I couldn't get my head round!
And "main trainer" was a bit of a red herring.
So well done again!
These compilers are getting ever more devious!