Generally I hadn't overly fussed adding the aspects of medals (bar|clasp)s, though today I thought that I would ask the question.
Item Sir Edward Maxwell Perceval (Q75622377) and s:Thom's Irish Who's Who/Perceval, Major-Gen. Sir Edward Maxwell It shows clasps to both the Queen's and King's medals. It seems that they should be something like a qualifier to count clasps.
Labelling clasps per w:Queen's South Africa Medal seems excessive as a first means and going to need a real depth of knowledge of subjects.
Here it may just fall into "that's nice" category, though with something like a Distinguished Service Order (Q615838) where a second awarding is granted then it gets a bar. Think that I just added the both allocation dates where I saw this.