Nude dancing clubs entertained one popularly sitting in the corner (5)
I believe the answer is:
dunce
'one popularly sitting in the corner' is the definition.
I can't tell whether this definition defines the answer.
'nude dancing clubs entertained' is the wordplay.
'dancing' is an anagram indicator.
'clubs' becomes 'c' (abbreviation in card games).
'entertained' means one lot of letters goes inside another.
'nude' with letters rearranged gives 'dune'.
'dune' enclosing 'c' is 'DUNCE'.
Can you help me to learn more?
(Other definitions for dunce that I've seen before include "Pupil" , "Bad scholar, may wear a paper cap" , "Dullard" , "Foolish cap wearer" , "Term of ridicule applied to followers of John Duns Scotus" .)