ink ‧ ling /ˈɪŋklɪŋ/ BrE AmE noun [countable usually singular]
[ Date: 1500-1600 ; Origin: Probably from inkle 'to say quietly, hint' (1300-1400) ]
a slight idea about something ⇨ suspicion :
I had an inkling that she was pregnant.
inkling of
She had absolutely no inkling of what was going on.