Laidback about measure on prohibition (6)
I believe the answer is:
denial
'prohibition' is the definition.
(thesaurus)
'laidback about measure' is the wordplay.
'laidback' becomes 'dial' (I can't justify this - if you can you should give a lot more credence to this answer).
'about' means one lot of letters goes inside another.
'measure' becomes 'en' (en is a kind of measure).
'dial' placed around 'en' is 'DENIAL'.
'on' acts as a link.
Can you help me to learn more?
(Other definitions for denial that I've seen before include "Renunciation" , "Repudiation" , "Refusal to admit painful truths" , "Refusal to acknowledge" , "Daniel (anag.)" .)