Bill & Co limp off to quiet do (10)
I believe the answer is:
accomplish
'do' is the definition.
(I've seen this before)
'bill co limp off to quiet' is the wordplay.
'bill' becomes 'ac' (short for account).
'off' indicates an anagram.
'to quiet' becomes 'sh' (both can be said to tell someone to be quiet).
'limp' anagrammed gives 'mpli'.
'ac'+'co'+'mpli'+'sh'='ACCOMPLISH'
(Other definitions for accomplish that I've seen before include "manage" , "Finish" , "carry out" , "Achieve successfully" , "Perform" .)