Letters in order, bathe with pal at work (8)
I believe the answer is:
alphabet
'letters' is the definition.
(I've seen this before)
'order bathe with pal at work' is the wordplay.
'order' indicates anagramming the letters.
'with' is a charade indicator (letters next to each other).
'at work' is an anagram indicator.
'bathe' with letters rearranged gives 'habet'.
'pal' anagrammed gives 'alp'.
'habet' after 'alp' is 'ALPHABET'.
'in' acts as a link.
(Other definitions for alphabet that I've seen before include "Complete set of letters" , "First elements (of language)" , "Letters, symbols used in a writing system" , "needing help on mountain height" , "lots of characters" .)