Revamp, touching coat by mistake (9)
I believe the answer is:
refurbish
'revamp' is the definition.
(thesaurus)
'touching coat by mistake' is the wordplay.
'touching' becomes 're' (I've seen this in other clues).
'coat' becomes 'fur' (fur is a kind of coat).
'by' says to put letters next to each other.
'mistake' becomes 'bish' (I've seen this in other clues).
're'+'fur'+'bish'='REFURBISH'
(Other definitions for refurbish that I've seen before include "Overhaul" , "Clean up" , "Renovate, redecorate" , "Freshen up" , "Redecorate and brighten up" .)