Prone to blushing, say
I believe the answer is:
shy
'prone to blushing say' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for shy that I've seen before include "Recoil" , "guarded" , "Bashful or timid" , "'Lacking self-confidence, timid (3)'" , "Fling or throw" .)