You have multiple choices here.
Loopback is sometimes a bad choice, since the client may try to connect
to itself, and in pathological cases this could cause an infinite loop.
You could consider an A record with RDATA 0.0.0.0, the "null" or
"unspecified" address. It is not legal for that ever
I need to block a host in an exterior domain.
Resolve all traffic for example.com from example.com¹s dns servers, but
stop badhost.example.com.
I guess I could become authoritative for badhost.example.com and point the
host to 127.0.0.1.
Does that sound like bad things would happen?
Zone ³badhost
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