The spelling of "am ones tail" can be confusing due to the presence of the homophonic sound of "ones" and "once". However, the correct spelling is "I am once's tail". The pronunciation of "once's" is /wʌnsɪz/, meaning it is the possessive form of "once". Therefore, the proper reading of the phrase would be "I am the tail of once", indicating that the speaker is subordinate to a particular event or circumstance in the past. The precise use of spelling and IPA helps to clarify meaning in this instance.