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:global ipaddress [/queue simple get 1 target];
:global test [:global ipaddress; :find $ipaddress "/"];

Inside the function, ipaddress is not known so you have refer to it by :global ipaddress.

Couple other things too:
- The first line use "get 1", however that's not an *id so it depends on print being called to establish the index of 1. Using "get ([find]->0)" or "get [find name=queue1]" instead avoid needing.
- There can be multiple "target" from "/queue simple get", and :find does not work with arrays & so need use get the 1st element listed as "target" first

For example,

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:global ipaddresses [/queue simple get [find name=queue1] target]
:global ipaddress [:pick $ipaddresses 0 ] 
:global cidrmark [:find  $ipaddress "/"]
:put "$[:pick $ipaddress 0 $cidrmark]"

Although these could be a locals and combined:

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{
:local ipaddress ([/queue simple get [find name=queue1] target]->0); 
:put "$[:pick $ipaddress 0 [:find  $ipaddress /]]"
}