Leaders of Sri Lanka invested in home-grown product a key part of the (5)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

First letters (leaders) of S [ri] L [anka] inserted into TEA (home-grown product: Sri Lanka is one of its major producers). The US electric car company, one of the world’s most valuable companies, which features in the US stock exchange NASDAQ (22 down).