The most common and most likely answer to this crossword clue is the 3 letter word SOD
I've seen this crossword clue in The Times
S
O
D
More clues leading to the result SOD
Buddy explains!

The straight part
We know that "this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this = sod.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 SOD mean?
SOD noun- That stratum of the surface of the soil which is filled with the roots of grass, or any portion of that surface; turf; sward.
- Turf grown and cut specifically for the establishment of lawns.
- To cover with sod.
- Sodomite; bugger.
- (mildly pejorative, formerly considered vulgar) A person, usually male; often qualified with an adjective.
- Any trifling amount, a bugger, a damn, a jot.
- Bugger; sodomize.
- Damn, curse, confound.
- Expression of surprise, contempt, outrage, disgust, boredom, frustration.
- To boil.
- (of a liquid) To boil vigorously.
- (of a liquid) To foam in an agitated manner, as if boiling.
- (of a person) To be in an agitated or angry mental state, as if boiling.
- (of a place) To buzz with activity.
- A damper (bread) which has failed to rise, remaining a flat lump.
- Boiled.
- (of bread) Sodden; incompletely risen.
- The rock dove.