gistfile1.txt

/tmp/test ❯ cat test.zsh
#!/bin/zsh

set -x

W='-iname *.txt'
find . ${=W}

set +x
/tmp/test ❯ zsh test.zsh
+test.zsh:5> W='-iname *.txt' 
+test.zsh:6> find . -iname '*.txt'
./a/bar.txt
./foo.txt
+test.zsh:8> set +x