Welshman's platform (4)
I believe the answer is:
dais
'platform' is the definition.
(I know that dais is a type of platform)
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for dais that I've seen before include "stage" , "stands on this?" , "Throne platform" , "Said (anag.)" , "stepping up here?" .)