From Longman Dictionary of Contemporary Englishsticklerstick‧ler /ˈstɪklə $ -ər/ noun → be a stickler for detail/rules/accuracy etc
Examples from the Corpus
stickler• Charman, a stickler for musical purity, did not relish the idea.• Montgomery is a stickler for defense, and Moseley caught on quickly.• The loosest woman is a stickler for etiquette and elocution.• You just have to have much better vision and not be such a stickler for detail to see ours.• With his personal guests who were important to him or his state, Kim was a stickler for detail.• A stickler for realism, he was frustrated by an obstinacy in his models as strong as his own.• Being sticklers for legal tradition, they plan to anyway, of course.• The chancellor is clearly no stickler for fiscal purity.Origin stickler (1500-1600) stickle “to argue about small points” ((16-20 centuries)), from stightle “to put in order” ((13-15 centuries)), from Old English stihtan 