I'm shocked at the 'suggestion' that he deliberately cheated. = The very 'suggestion' that he deliberately cheated is shocking (to me).
They were careful to avoid any 'suggestion' of impropriety. [=avoid doing anything that could be seen as improper]
There was some 'suggestion' of swelling around his ankle. [=his ankle appeared to be slightly swollen]
(..) I'm retired, Oliver. You fired me. The thing is, some time ago before Control died, he came to me with a similar suggestion. That there is a mole. He never mentioned his suspicions to you? No. Oh, I just thought that (..)2011 Tinker Tailor Soldier Spy