Thingummyjig has twit discombobulated (7)

I believe the answer is:

whatsit

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'thingummyjig' is the definition.
I know nothing about this answer so I cannot judge whether this works.

'has twit discombobulated' is the wordplay.
'discombobulated' is an anagram indicator.
'has'+'twit'='hastwit'
'hastwit' is an anagram of 'WHATSIT'.

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(Other definitions for whatsit that I've seen before include "Something one can't recall" , "person not to be named" , "Thingummy" , "something indefinable" , "Thingumajig" .)

I've seen this clue in The Times.

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