Show disapproval about being detained by boring thing one cannot name (6)
I believe the answer is:
doobry
'thing one cannot name' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.
'show disapproval about being detained by boring' is the wordplay.
'show disapproval' becomes 'boo' (as in a crowd booing).
'about' shows that the letters should be reversed in order.
'being detained by' indicates putting letters inside (I've seen this in other clues).
'boring' becomes 'dry' (dry can mean dull or boring).
'boo' written backwards gives 'oob'.
'oob' placed inside 'dry' is 'DOOBRY'.
Can you help me to learn more?
(Other definitions for doobry that I've seen before include "Thingy" , "Unspecified object" .)