LEADING PARTNER’S SUIT (OR A BID AND SUPPORTED SUIT).
There are no blind leads, only deaf players. A cliché yes, but even the most tired of clichés makes a grain of sense.
In this case when the partnership has bid a suit, or doubled a suit, or doubled the final contract, there may be anything from a small clue to the equivalent of a hammer-blow to the head.
Let’s see how strong you think the indications are here!