be (a) one for (something)
To be someone who likes or excels at doing something. I'll never be one for public speaking, that's for sure—my palms are sweating just thinking about it!
be (a) one for something/for doing something
(informal) be a person who enjoys something, or does something often or well: She’s not one for staying up late — she likes to be in bed by eleven.They live in the country and they’re great ones for long walks.