The most common and most likely answer to this crossword clue is the 6 letter word DOODAH
D
O
O
D
A
H
More clues leading to the result DOODAH
- Gadget had two zips and diamonds all over
- Gismo functions in both directions, I say
- Fuss when two of hearts switched for diamonds with gizmo
- Flipping gangster, holding a daughter’s whatsit
- Daughter had rings put back in ornament
- Gadget trouble written up in note
- Robin flying back clutching the old man’s trinket
- Thingummybob emerging from back-to-back parties –- oh dear
- Gangster holding plug the wrong way for gadget
Buddy explains!

The straight part
We know that "gizmo" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case gizmo = doodah.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 DOODAH mean?
DOODAH noun- A thing; especially an unspecified gadget, device, or part.