Collect some bread in unusual haste (has pocket emptied)? (4,5,3,3)

'unusual haste has pocket emptied?' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'collect some bread' is the wordplay.
I cannot really understand how this works, but
'some' could be 'a' and 'a' is present in the answer.
'bread' could be 'round' (I've seen this before) and 'round' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

'in' acts as a link.

Can you help me to learn more?