Small copper line on celebrity's dishwasher? (8)
I believe the answer is:
scullion
'dishwasher?' is the definition.
(servant cleaning dishes)
'small copper line on celebrity's' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'copper' becomes 'cu' (chemical symbol).
'line' becomes 'l' (used when specifying particular lines from a poem).
'on' means one lot of letters go next to another.
'celebrity' becomes 'lion' (both can mean a celebrated person).
's'+'cu'+'l'+'lion'='SCULLION'
(Other definitions for scullion that I've seen before include "Lowly kitchen worker" , "Of old, the servant assigned the most menial kitchen tasks" , "Kitchen servant - contemptible person" , "Mean or despicable person" .)