The phrase "haddest use for" is a somewhat outdated way of saying that something was of use or needed by someone in the past tense. However, there are many synonyms that can be used in its place in order to give more variety and nuance to your writing or speech. Some possible options include "needed," "had a use for," "required," "was dependent on," "benefited from," "was useful to," or "served a purpose for." Depending on the precise context, other potential synonyms may be appropriate as well. Experiment with different choices in order to find the one that sounds most natural and appropriate for your specific sentence or phrase.