Stand at Leeds ground under roof of pavilion (8)
I believe the answer is:
pedestal
'stand' is the definition.
(I know that stand can be written as pedestal)
'at leeds ground under roof of pavilion' is the wordplay.
'ground' indicates an anagram ('grind' the letters into a new form).
'under' says to put letters next to each other.
'roof of' indicates taking the first letters (in a down clue, the top letter).
The initial letter of 'pavilion' is 'p'.
'at'+'leeds'='atleeds'
'atleeds' with letters rearranged gives 'edestal'.
'edestal' after 'p' is 'PEDESTAL'.
(Other definitions for pedestal that I've seen before include "Desk drawer unit" , "Base supporting a statue" , "Statue's support" , "Base on which something is mounted" , "Stand for statue or basin" .)