I have a hot rman backup that I want to use to clone/restart another database at another site. The fact is that I don't have a catalog database there but have RMAN. Can I restore/clone it.
What do you mean by "clone/restart another database"? Is there a database already present or you want to create a new one?
Your questions seems very confusing. Please be clear on keywords while you post questions. Also please post what oracle versions are you using here
If I understood you correctly do you want use hotbackup of one database and clone on to another database on seperate server?
Yes, the RMAN DUPLICATE DATABASE command can be run without necessarily connecting to a Catalog.
See Duplicating a Database
and Duplicating a Database: Advanced Topics
and Oracle Support Note "RMAN Duplicate Database From RAC ASM To RAC ASM (Doc ID 461479.1)"
Hemant K Chitae