Disinclination to speak freely (9)

I believe the answer is:

reticence

(Other definitions for reticence that I've seen before include "Tendency to be reserved in communication" , "Unwillingness to talk" , "Tendency to hold back" , "Quality of being sparing in communication" , "'Reserve, taciturnity (9)'" .)

I've seen this clue in the Sydney Morning Herald.

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