Quiet time that hurt one easily convinced (4,5)
I believe the answer is:
soft touch
'quiet time that hurt one easily convinced' is the definition.
The definition suggests a singular noun which matches the answer.
'quiet time that hurt' is the wordplay.
'quiet' becomes 'soft' (similar in meaning).
'time' becomes 't' (abbreviation).
'that hurt' becomes 'ouch' (expression of pain).
'soft'+'t'+'ouch'='SOFT TOUCH'
Can you help me to learn more?
(Other definitions for soft touch that I've seen before include "mug?" , "Person who can be fooled" , "by no means a great hit" , "Hut of Scot (anag.)" , "gentle handling" .)