Avoid ‘upper-class’ in description of current King (4)
I believe the answer is:
duck
'avoid' is the definition.
(duck can mean to avoid)
'upper-class in description of current king' is the wordplay.
'upper-class' becomes 'u' (similar in meaning).
'in' indicates putting letters inside.
'description of current' becomes 'dc' (I can't justify this - if you can you should give a lot more credence to this answer).
'king' becomes 'K' (abbreviation for king in chess).
'u' placed inside 'dc' is 'duc'.
'duc'+'k'='DUCK'
Can you help me to learn more?
(Other definitions for duck that I've seen before include "Water bird - get out of the way" , "Use one's wits to get something" , "Zero runs; bird" , "Dear; bird; fabric" , "strong cloth" .)