Softly chants as tension's broken (7)
I believe the answer is:
intones
'softly chants' is the definition.
'intones' can be an answer for 'chants' ('intone' can be a synonym of 'chant'). I'm unsure of the 'softly' bit.
'tension's broken' is the wordplay.
'broken' is an anagram indicator.
'tension' is an anagram of 'INTONES'.
'as' acts as a link.
Can you help me to learn more?
(Other definitions for intones that I've seen before include "Chants" , "Recites in a chanting voice" .)