Free BBC after first of August (5)
I believe the answer is:
untie
'free' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for untie that I've seen before include "get rid of bonds" , "Release, loosen" , "Release from bonds or open shoelace" , "Unite (anag)" , "Detach" .)