if its an automatic transmission then the oil cooler for trans is inside the main rad and can leak over time
in which case you can get oil in the water and the whole radiator must be replaced
now if its just a drip from the hose clip try tightening up the clip , possibly the hose and clip may need replacing
if its not an auto then its possibly a coolant drip ? in which case check the clip tightness and condition of the hose and again these may need replacing
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not at all , a typical parts cost is about £50 including coolant and allow an hours labour if you're not doing the job yourself
its called a bottom hose for the radiator and you'll need a hose clip to match it if you ask for a jubilee type clip then these are easier to use - and you can either buy the parts from a nissan dealership or from most generic car parts suppliers like Eurocar parts