Copper, quiet one, on soft pad (7)
I believe the answer is:
cushion
'soft pad' is the definition.
'cushion' can be an answer for 'pad' (I've seen this before). I am not certain of the 'soft' bit.
'copper quiet one on' is the wordplay.
'copper' becomes 'Cu' (Cu is the chemical symbol for copper).
'quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'one' becomes 'i' (Roman numeral).
'cu'+'sh'+'i'+'on'='CUSHION'
Can you help me to learn more?
(Other definitions for cushion that I've seen before include "Part of a billiard table" , "Chair pad or pillow" , "Soften (the effect of an impact)" , "Soft pad, of feathers say" , "Buffer" .)