What's inhaled by queen - king's rolling a joint (4)
I believe the answer is:
knee
'a joint' is the definition.
(I know that knee is a type of joint)
'what's inhaled by queen king's rolling' is the wordplay.
'what's inhaled by queen' becomes 'een' (I can't justify this - if you can you should believe this answer much more).
'king' becomes 'K' (chess abbreviation).
'rolling' says the letters should be written backwards.
'een'+'k'='eenk'
'eenk' back-to-front is 'KNEE'.
Can you help me to learn more?
(Other definitions for knee that I've seen before include "for going on begging" , "Leg hinge" , "Joint of the body" , "Human joint" , "Thigh/shin connector" .)