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4D bitter officer killed guards. I?E/?O?D

Think it might be ice cold. Can see col for officer but why the rest?

1D Business concerned with protective clothing
C?C?O? thought It might be cocoon but no idea why!

ICED is urban slang for killed, as to "ice" someone is to murder them.

Apparently!

I suspect this is CO CO for business(es), ON = concerned with and COCOON is a protective casing. It is also a style of coat.

Very obscure, but I am sure you are right!

Many thanks