Crossword Genius

Gadget item somehow messing with our heads? (5)

Ross

I believe the answer is:

gismo

'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...

(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 the Independent.
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