Clumsy walk behind junction? Nonsense (7)
I believe the answer is:
twaddle
'nonsense' is the definition.
(informal term for nonsense or rubbish)
'clumsy walk behind junction?' is the wordplay.
I cannot really understand how this works, but
'walk' could be 'waddle' (waddle is a kind of walk) and 'waddle' is present in the answer.
'junction?' could be 't' and 't' is located in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for twaddle that I've seen before include "Foolish speech/writing" , "bunk" , "Poppycock" , "Stuff and nonsense" , "Balderdash" .)