Everything in local launderette (3)
I believe the answer is:
all
'everything' is the definition.
(all things)
'in local launderette' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ALL' is hidden within 'local launderette'.
(Other definitions for all that I've seen before include "and 18: 'Sing through -- --' (carol)" , "'Bless 'em - - ' (song)" , "that's as many as there are" , "Total" , "Wholly" .)