The most common and most likely answer to this crossword clue is the 8 letter word HARVESTS
I've seen this crossword clue in The Daily Telegraph
H
A
R
V
E
S
T
S
Buddy explains!

The straight part
We know that "Yields" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case yields = harvests.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 HARVESTS mean?
HARVESTS noun- The third season of the year; autumn; fall.
- The season of gathering ripened crops; specifically, the time of reaping and gathering grain.
- The process of gathering the ripened crop; harvesting.
- The yield of harvesting, i.e., the gathered crops or fruits.
- (by extension) The product or result of any exertion or course of action; reward or consequences.
- A modern pagan ceremony held on or around the autumn equinox, which is in the harvesting season.
- To bring in a harvest; reap; glean.
- To be occupied bringing in a harvest
- To win, achieve a gain.