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Your picture is certainly an adult male Clubiona species, but it could be any one of a number of species. The only way to be sure is by microscopical examination of the male palp, where each species has a distinctive structure not visible in a photograph in sufficient detail to see the necessary diagnostic bits. Your photo suggests the spider was on the leaf of a bush or tree? If so it is very unlikely to be Clubiona reclusa, a spider usually found in tall grassland, herbage or the drier parts of marshes. There are a range of possibilities both with Clubiona found in grasslands and herbage and those usually found on trees or scrub and only a few species are at all distinctive in their pattern. It is a genus of look-alikes!