Leader of DUP having sex is quaintly comical (5)
I believe the answer is:
droll
'quaintly comical' is the definition.
'droll' can be an answer for 'comical' (I've seen this before). I'm not certain of the 'quaintly' bit.
'leader of dup having sex' is the wordplay.
'leader of' indicates taking the first letters.
'having' means one lot of letters go next to another.
'sex' becomes 'roll' (having 'a roll in the hay' means having sex).
The initial letter of 'dup' is 'd'.
'd'+'roll'='DROLL'
'is' is the link.
Can you help me to learn more?
(Other definitions for droll that I've seen before include "Funny" , "Strangely amusing" , "Clownish" , "Dry" , "Comical in an odd or whimsical manner" .)