The most common and most likely answer to this crossword clue is the 6 letter word SHELVE
I've seen this crossword clue in The Guardian
S
H
E
L
V
E
More clues leading to the result SHELVE
- Put off woman and survive without one
- Lady paramour, love lost, set aside
- Not given ring, female sweetheart put off
- Postpone research, having day off? Be quiet on that
- Drop reform of vehicles? Losing intensive care just the start
- Some puckish elves put aside
- Slope put on ice
- Put off by love, he’s rejecting old arrangement
- He’s munching nothing except duck, that’s put aside
- Make provision for volumes put aside
Buddy explains!

The straight part
We know that "Drop" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case drop = shelve.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 SHELVE mean?
SHELVE noun- A rocky ledge or shelf.
- To place on a shelf.
- To set aside; to quit or postpone.
- To furnish with shelves.
- To take (drugs) by anal or vaginal insertion.
- To have sex with.
- To slope; to incline; to form into shelves.