Like a sandbag, it has striking potential (7)
I believe the answer is:
handbag
'it has striking potential' is the definition.
The definition suggests a singular noun which matches the answer.
'like a sandbag' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is found in the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for handbag that I've seen before include "Woman's carrier" , "Woman's holdall?" , "Container for carrying personal items" , "Purse (in America)" , "Grip" .)