Could tomb wall I'm tampering with be a disaster waiting to happen? (4,4)
I believe the answer is:
time bomb
'tampering with be a disaster waiting to happen?' is the definition.
I can't tell whether this defines the answer.
'could tomb wall i'm' is the wordplay.
I cannot quite see how this works, but
'i'm' could be 'me' (both refer to the person speaking or writing) and 'me' is located in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for time bomb that I've seen before include "weapon" , "Device set to explode later" , "Exploding ticker?" , "Its detonation is delayed" , "one should go off to order" .)