The most common and most likely answer to this crossword clue is the 3 letter word SPA
I've seen this crossword clue in The Times
S
P
A
More clues leading to the result SPA
- Beginners in studio photographed as well
- Son meeting father in spring
- Resort featured in this paper
- Openings for staff, promising, at health centre
- Country with no popular resort
- Spring appears, finally, every year
- Bath for one son, given by father
- Health resort featured in newspaper
- Boom announced in spring
- Bath possibly an afterthought when getting up
Buddy explains!

The straight part
We know that "spring" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spring = spa.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 SPA mean?
SPA noun- A health resort near a mineral spring or hot spring.
- A trendy or fashionable resort.
- A health club.
- A hot tub
- A clumsy person (see spastic)
- An idiot
- A gobshite