To the hiring managers or recruiters out there, what’s an acceptable answer on my last role being 3 months?

I’ll be honest. I failed probation because I didn’t ramp up hard enough in the first few weeks. I assumed it would be ok to do things in iterations and that I was having my homework marked. I was not. I was expected to have things ready to ship from the get go. My manager lost trust in me fast. We had a real personality clash too. With someone else it may have turned out differently, I did try hard to get things back on track, did a lot of overtime and we even finished work ahead of schedule but the damage was done. I also felt by the end of it, the job was really not the place for me. I started getting extremely stressed out and losing sleep. It really felt like she was trying to get me out the door and there wasn’t going to be a way to recover. They did confirm to me that references will only be title and dates. I’m considering several options \- it was a temp contract for 3 months to finish but a government project (it wasn’t however. It was a perm contract) \- a degree of honesty, it was a start up which just didn’t work for me and not somewhere I saw progression. I’ve no idea how to handle this. I was much too honest about it in a final round for a brilliant job and I could see the shock in the interviewers face when I said it. Interview wrapped up quickly. I’d like to hear anyone who’s on the other side of the table and get a feeling of what you’d think that you could work with