Be/live in clover
Definition 1 of 1
Pro Tip 1/3Positive Connotation
The phrase suggests a happy, easy life, free from financial worries. 
Winning the lottery meant she could now live in clover.
Pro Tip 2/3Idiomatic Usage
It's an idiomatic expression, so use it in casual settings, not formal writing. 
Ever since Jack sold his startup, he's been living in clover.
Pro Tip 3/3Wealth Implication
Often implies sudden or unexpected wealth, but not always. 
They inherited a fortune and have been in clover since.