The most common and most likely answer to this crossword clue is the 6 letter word RIVERS
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More clues leading to the result RIVERS
Buddy explains!

The straight part
We know that "Perhaps Krishna/& Son" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case perhaps krishna/& son = rivers.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does RIVERS mean?
RIVERS noun- A large and often winding stream which drains a land mass, carrying water down from higher areas to a lower point, oftentimes ending in another body of water, such as an ocean or in an inland sea.
- Any large flow of a liquid in a single body.
- The last card dealt in a hand.
- A visually undesirable effect of white space running down a page, caused by spaces between words on consecutive lines happening to coincide.
- To improve one’s hand to beat another player on the final card in a poker game.
- One who rives or splits.