Forbid the breaking of bread (5)
I believe the answer is:
debar
'forbid the breaking' is the definition.
'debar' can be an answer for 'forbid' (debarring is a kind of forbiding). I am not sure about the 'the breaking' bit.
'of bread' is the wordplay.
'of' is an anagram indicator (the answer comes from or 'of' the letters).
'bread' with letters rearranged gives 'DEBAR'.
Can you help me to learn more?
(Other definitions for debar that I've seen before include "Blackball" , "Keep out" , "Shut out, preclude" , "Prohibit (from doing something)" , "Black" .)