Line pulled from detective's boiler a little floppy (8)
I believe the answer is:
diskette
'floppy' is the definition.
(I know that floppy can be written as diskette)
'line pulled from detective's boiler a little' is the wordplay.
I cannot really understand how this works, but
'detective's' could be 'dis' (Detective Inspector) and 'dis' is present in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for diskette that I've seen before include "Small floppy disk" , "(Computer) magnetic medium" , "Computer item for storing data" .)