Idaho woman turned to heifer: bovine tuberculosis is seen in set (5,3)
I believe the answer is:
idiot box
'set' is the definition.
(idiot box is a kind of set)
'idaho woman turned to heifer bovine tuberculosis is' is the wordplay.
I cannot quite understand how this works, but
'woman' could be 'di' and 'di' is found in the answer.
'bovine' could be 'ox' (ox is a kind of bovine) and 'ox' is found in the answer.
'tuberculosis' could be 'tb' ('TB' can be a synonym of 'tuberculosis') and 'tb' is found in the answer.
The remaining letters 'io' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
'seen in' acts as a link.
Can you help me to learn more?
(Other definitions for idiot box that I've seen before include "TV set (US colloq.)" , "TV (slang)" , "TV revealed" , "tube" .)