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cat data-file.txt |sed 's/^Cluster//'|sort -k1 -n|sed 's/^\([0-9]\+\)/
+Cluster\1/' > sorted-data.txt

$ cat dd |sed 's/^Cluster//'|sort -k1 -n|sed 's/^\([0-9]\+\)/Cluster\1
+/'| cut -c 1-20
Cluster5        SP_1003(con
...
Cluster10       SP_0042(co
Cluster10       SP_0042(co
Cluster10       SP_0042(co