'High wire' used as a figure of speech on Thai radio (9)
I believe the answer is:
tightrope
'high wire' is the definition.
(I've seen this before)
'a figure of speech on thai radio' is the wordplay.
I cannot really see how this works, but
'figure' could be 'trope' (synonyms) and 'trope' is found in the answer.
This explanation may well be incorrect...
'used as' acts as a link.
Can you help me to learn more?
(Other definitions for tightrope that I've seen before include "An acrobat walks on this high above the ground" , "Difficult thing to walk on" , "- - -walker" , "Acrobat's walkway" , "Cable on which acrobatics are performed" .)