The most common and most likely answer to this crossword clue is the 5 letter word GISMO
I've seen this crossword clue in The Guardian
G
I
S
M
O
More clues leading to the result GISMO
- How a soldier operates device
- Gadget made by US soldiers and army medic
- device
- Component of thing is motorized doohickey
- Device for soldier’s way of working
- Gadget offering game in theory? The opposite
- In essence, time taken over minute device
- Try to include philosophy device
- Soldier’s second gadget
- Try to hold distinctive movement device
Buddy explains!

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 GISMO mean?
GISMO noun- Something, generally a device, for which one does not know the proper term.