Ineffective female missing state of dangerous plug? (7)
I believe the answer is:
useless
'ineffective' is the definition.
(associated in meaning)
'female missing state of dangerous plug?' is the wordplay.
I cannot quite understand how this works, but
'state' could be 'us' (U.S. is an example) and 'us' is present in the answer.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for useless that I've seen before include "Futile and unavailing" , "Unserviceable" , "Vain, impractical" , "Fruitless" , "Having no beneficial function" .)