Quiet section in speech (5)
I believe the answer is:
peace
'quiet' is the definition.
(I've seen this before)
'section in speech' is the wordplay.
'section' becomes 'piece' (I've seen this in another clue).
'in speech' indicates a 'sounds like' (homophone) clue.
'piece' sounds like 'PEACE'.
(Other definitions for peace that I've seen before include "State of freedom from war" , "Calm, tranquility" , "Freedom from disturbance, tranquillity" , "See 1" , "Absence of war" .)