I do have two girl Clive's, my genderbend and my trans fem Clive HC so i guess this leans more to the second.
I believe she cracked her egg at her late thirties, maybe during prison? I know the "i may be nonbinary but i can't think about that rn i have to go to work" is silly and funny but that's him to me lol, being so focused on his goals made him blind about his most personal matters such as his identity... Realizing she was trans was very hard to her mostly because she felt like she was betraying the memory of his parents and how they watched him grow. (I'm obviously nOT projecting here lalalalala). Her femenine presentation in public isn't something that always happens, she enjoys wearing both masculine and femenine clothes, maybe using specific accesories when she presents more masc for his own comfort yknow. This is seen as crossdressing for other people but i think he doesn't care that much about what other people think he is, he never cared about people that much anyways lol, so he lets himself to enjoy. Shes very reserved about her trans identity because it's something too personal for her. Clive is a very closed character i believe so