Part of bolt on doorframe painted round (5)
I believe the answer is:
tondo
'painted round' is the definition.
The definition suggests a singular noun which matches the answer.
'part of bolt on doorframe' is the wordplay.
'part of' indicates a hidden word.
'TONDO' is hidden in the letters of 'bolt on doorframe'.
Can you help me to learn more?
(Other definitions for tondo that I've seen before include "Style of painting" , "work of art" , "One among artistic circles" , "Circular painting, relief carving" , "art circle?" .)