On which to stand cut flower belonging to Welshman? (4)
I believe the answer is:
dais
'on which to stand' is the definition.
(dais is a type of platform or stand)
'cut flower belonging to welshman?' is the wordplay.
'cut flower belonging' becomes 's' (I can't justify this - if you can you should give a lot more credence to this answer).
'to' says to put letters next to each other (I've seen this in other clues).
'welshman?' becomes 'dai' (Welsh name).
's' put after 'dai' is 'DAIS'.
Can you help me to learn more?
(Other definitions for dais that I've seen before include "stepping up here?" , "Low platform at end of hall" , "device to give some an uplift at conference?" , "stand" , "stands on this?" .)