A convenience conceals dead boys (7)
I believe the answer is:
laddies
'boys' is the definition.
(laddie is a kind of boy)
'a convenience conceals dead' is the wordplay.
'a convenience' becomes 'ladies' (I've seen this before).
'conceals' indicates putting letters inside.
'dead' becomes 'd' (abbreviation in government records).
'ladies' placed around 'd' is 'LADDIES'.
(Other definitions for laddies that I've seen before include "young men" , "Boys" .)