Crossword Genius

Gadget item somehow messing with our heads? (5)

Ross

I believe the answer is:

I'm a little stuck... Click here to teach me more about this clue!

'gadget' is the definition.
(I've seen this before)

'item somehow messing with our heads?' is the wordplay.
I cannot quite understand how this works, but
'heads?' could be 'is' (heading is a kind of being) and 'is' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for gismo that I've seen before include "Device of American", "Ingenious gadget", "Fancy device", "Gadget (colloq.)", "Useful (but unspecified) device".)

I've seen this clue in Independent and The Independent.