Silver on a stove (3)
I believe the answer is:
aga
'stove' is the definition.
(I've seen this before)
'silver on a' is the wordplay.
'silver' becomes 'Ag' (Ag is the chemical symbol for silver).
'on' says to put letters next to each other (in a down clue, letters appear on others).
'ag'+'a'='AGA'
(Other definitions for aga that I've seen before include "of the 17 [KITCHEN]" , "Overseas commander" , "Type of stove" , "In Turkey, an official" , "--- Khan, spiritual head of Ismaili Muslims" .)