Lively revamped bar 1000 spread throughout (7)
I believe the answer is:
pervade
'spread throughout' is the definition.
(I've seen this before)
'lively revamped bar 1000' is the wordplay.
'lively' is an anagram indicator (I've seen this in other clues).
'bar' is a deletion indicator.
'1000' becomes 'M' (synonyms).
'revamped' with 'm' removed is 'revaped'.
'revaped' anagrammed gives 'PERVADE'.
(Other definitions for pervade that I've seen before include "Permeate" , "Occur in every part of" , "Deprave (anag)" , "Spread throughout" , "Suffuse" .)