The conflict between trans-inclusive and trans-exclusionary radical feminists (TERFs) has recently erupted in the post-Yugoslav space, adding to the urgency of embracing trans-feminism. In order to forge the ground for such a feminist orientation, this paper interweaves two theoretical reflections: the subject of feminism, and the historical lesbian experience of becoming ‘included’ with/in it. Beginning with the idea that, similarly to trans, it also took time and effort for lesbianity (see discussion on this concept in the article) to be recognised as a ‘legitimate’ subject of feminist emancipation, I extend Wittig's negation of lesbian womanhood to trans women. With this in mind, I argue that feminist radical solidarity requires an open-ended, liminal conception of gender. I then draw upon nine interviews with predominantly cis-gender lesbian activists from the post-Yugoslav space to explore the ways in which they endeavoured to bring about feminist radical solidarity in their activist engagement. I conclude that solidarity rather than normative inclusion that we, lesbians, fought for as feminists, should eventually be put at the service of trans-feminism. Like that, trans-feminism can become an integral part of women studies, trans women can be recognised as subjects of feminism, and trans persons embraced as our political and personal allies.