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24ac Channel is to broadcast for grub.
R - - - L -
I think it ends LE, coz it will sound like channel will do something - but I can't think of a channel beginning with R that will make a suitable word for grub.

rootle?

I was also looking at this, A 'Rindle' is a channel, but I cannot connect the rest of the clue.

rootle vi to grub
route a channel

I quite like Rootle (to grub)

Channel - Route

Is to [will] (abb) 'll

Broadcast [ sounds like]

My eyes have been opened, thanks.

Thanks, Andy C - I had the right reasoning, but couldn't get to the word - and Mamya for confirming it.
Two more to do - onward and upward - I may be back for more help!