Character set to move a table outside pub (8)
I believe the answer is:
alphabet
'character set' is the definition.
(alphabet is a kind of character set)
'to move a table outside pub' is the wordplay.
'to move' indicates anagramming the letters (I've seen 'moving' mean this).
'outside' means one lot of letters goes inside another.
'pub' becomes 'ph' (public house).
'a'+'table'='atable'
'atable' is an anagram of 'alabet'.
'alabet' going around 'ph' is 'ALPHABET'.
(Other definitions for alphabet that I've seen before include "A set of language letters" , "Whole set of letters" , "needing help on mountain height" , "series of letters" , "A to Z inclusive" .)