The most common and most likely answer to this crossword clue is the 3 plus 3 letter word HOT TUB
I've seen this crossword clue in The Daily Telegraph
H
O
T
T
U
B
More clues leading to the result HOT TUB
- Perhaps Spooner's nursery outside Bath?
- Where bather may be twirling backside – gosh!
- Bang up to date, but turned up in Bath
- Stop returning cask, it contains heated water
- Excessive to plunge into centre in jacuzzi?
- Two times nothing coming up in hard university book where we can immerse ourselves in numbers
- Large bath as focal point — too much inside
- Central location houses extravagant bath
- It can be very warm and wet outside the chalet
- Too much poured into centre’s large bath
Buddy explains!

The straight part
We know that "Large bath" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case large bath = hot tub.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.