50across (9) letters full of humorous irony _ a _ i_ i _ a _
89 a (7) letters period of house rental _ e _ a _ c _
92 down (8) letters leap to conclusions about p _ e _ u _ g _
any help please
DIY is an acronym, not a word so the indication of letters is important, also did it indicate an abbreviation?
You usually assemble a kit.
A do it yourself project may not need assembly, eg: decorating a room.