Tummy - with starters turning - it's not a good sign (3,4)
I believe the answer is:
bad omen
'it's not a good sign' is the definition.
(a bad omen is a bad sign)
I cannot understand how the rest of the clue works.
(Another definition for bad omen that I've seen is " sinister portent".)
I've seen this clue in The Independent.
Want a hint initially instead of a full solution?
Install my app