Welshman beginning to spout from platform (4)
I believe the answer is:
dais
'platform' is the definition.
(dais is a kind of platform)
'welshman beginning to spout' is the wordplay.
'welshman' becomes 'dai' (I've seen this before).
'beginning to' suggests taking the first letters.
The first letter of 'spout' is 's'.
'dai'+'s'='DAIS'
'from' is the link.
(Other definitions for dais that I've seen before include "Low platform at end of hall" , "Speaker's raised platform" , "Raised floor" , "stage" , "stepping up here?" .)