Sound of foot soft carpets kept back (5)
I believe the answer is:
stamp
'sound of foot' is the definition.
'stamp' can be an answer for 'foot' (thesaurus). I am not certain of the 'sound of' bit.
'soft carpets kept back' is the wordplay.
'soft' becomes 'p' (musical abbreviation for 'piano', soft).
'carpets' becomes 'mats'.
'kept back' is a reversal indicator.
'p'+'mats'='pmats'
'pmats' backwards is 'STAMP'.
Can you help me to learn more?
(Other definitions for stamp that I've seen before include "Validation for a letter - tread heavily" , "Tread heavily (on an envelope?)" , "Bring foot down hard" , "squash?" , "contributions?" .)