Witness recalled insecure tone (5)
I believe the answer is:
noter
'witness' is the definition.
(I've seen this in another clue)
'recalled insecure tone' is the wordplay.
'NOTER' is hidden back-to-front in amongst the letters.
However, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for noter that I've seen before include "He jots things down" , "One observes" .)