I assume you have been through this document:
https://assets.publishing.service.gov.u ... racter.pdf
What is a "conditional caution" - would you get custodial if you offended again, and how long in force?
I don't have direct experience of this but I would think it would be useful/helpful to your case that first of all you disclose the offence, give details as to how it came to it, and explain how you you have fared since then, have you reformed yourself, attended some kind of help programme, done some community volunteering?
From my understanding, anything which doesn't get an automatic refusal, will be considered on the "balance of probabilities" - so if it was the only offence ever and no offending in any way since then.
Clearly nobody here will guarantee you that you will be approved but if you want to go through with the application show that you have thought about this issue, be open. Others may add to this.