The most common and most likely answer to this crossword clue is the 4 plus 3 letter word BRAN TUB
I've seen this crossword clue in The Times
B
R
A
N
T
U
B
More clues leading to the result BRAN TUB
- American boy outside shouting where are hidden presents?
- Bishop raised objection about supervised lucky dip
- Lucky dip bishop organised, backing nevertheless also required
- But arrest’s set back, securing right hiding place for the present?
- Mind one scratching, having just turned up here for lottery
- Lucky dip bishop organised, only with backing
- A fair source of gifts?
Buddy explains!

The straight part
We know that "Lucky dip" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lucky dip = bran 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.