The most common and most likely answer to this crossword clue is the 4 plus 8 letter word HANG TOGETHER
I've seen this crossword clue in The Guardian
H
A
N
G
T
O
G
E
T
H
E
R
More clues leading to the result HANG TOGETHER
Buddy explains!
The straight part
We know that "Make sense/as might exhibits in gallery collection" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case make sense/as might exhibits in gallery collection = hang together.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.