The most common and most likely answer to this crossword clue is the 7 letter word SHROOMS
I've seen this crossword clue in The Guardian
S
H
R
O
O
M
S
Buddy explains!
The straight part
We know that "They offer trips" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they offer trips = shrooms.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 SHROOMS mean?
SHROOMS noun- (usually in the plural) A magic mushroom: a hallucinogenic fungus.
- Any mushroom.