Broadcast removes restrictions on moratorium (6)
I believe the answer is:
freeze
'restrictions on moratorium' is the definition.
'freeze' can be an answer for 'moratorium' (thesaurus). I'm not certain of the 'restrictions on' bit.
'broadcast removes' is the wordplay.
'broadcast' indicates a 'sounds like' (homophone) clue (how the word might sound on the radio or TV).
'removes' becomes 'frees' (freeing is a kind of removing).
'frees' is a homophone of 'FREEZE'.
Can you help me to learn more?
(Other definitions for freeze that I've seen before include "period of cold weather" , "Suddenly become still" , "Solidify due to decrease in temperature" , "Change liquid to solid through cooling" , "Render very cold" .)