inkling
From Longman Dictionary of Contemporary Englishinklingink‧ling /ˈɪŋklɪŋ/ noun [countable usually singular]
IDEAa slight idea about something → suspicion
had an inkling that she was pregnant. I inkling of
She had absolutely no inkling of what was going on.Examples from the Corpushad an inkling• Perhaps he also had an inkling of an altogether more thorough-going solution.• It was as though he had an inkling who it would be.• He had an inkling he was the only one who could decipher the code.• I had an inkling that he had gone to Los Angeles.• Nutty had an inkling, but couldn't believe it.• None of the players had an inkling.• I think she, too, had an inkling.Origin inkling (1500-1600) Probably from inkle “to say quietly, hint” ((1300-1400))