Sentence:  It's at nine <WSD>o'clock</WSD> about two feet in from the edge of the branch. You need to know your ""o'clocks"" (nondigital) to spot birds. 
Meaning of the word marked with <WSD> tags:  In conjunction with a numeral, indicates the direction, relative to the speaker or a vehicle, especially an aircraft, corresponding to the direction the hour hand is pointing at the time corresponding to the numeral, with twelve representing directly ahead and three being to the right.