Radio station's broadcast about reading — and writing? (10)
I believe the answer is:
transistor
'radio' is the definition.
(type of radio)
'station's broadcast about reading and writing?' is the wordplay.
I cannot really see how this works, but
'about' could be 'a' (abbreviation in Chambers) and 'a' is located in the answer.
'reading' could be 'r' (one of the traditional three R's of education) and 'r' is found within the answer.
'and' could be 'n' (common abbreviation for 'and') and 'n' is located in the answer.
'writing?' could be 'r' (one of the traditional three R's of education) and 'r' is present in the answer.
This explanation may well be incorrect...
(Other definitions for transistor that I've seen before include "Electronic device" , "Electronic component" , "Semiconductor device" , "Radio" .)