WordNet sense 1 (a slight but appreciable addition):

jot, mite, pinch, soupcon, speck, tinge, touch

WordNet sense 2 (a just detectable amount):

suggestion, trace

WordNet sense 3 (an indirect suggestion):

breath, intimation

WordNet sense 4 (a slight indication):

clue

WordNet sense 5 (an indication of potential opportunity):

lead, steer, tip, wind, wind, lead, lead, confidential information

WordNet sense 6 (drop a hint; intimate by a hint):

suggest