Elegant and witty, eases oddly inside (6)
I believe the answer is:
dressy
'elegant' is the definition.
(I've seen this before)
'witty eases oddly inside' is the wordplay.
'witty' becomes 'dry' (both can mean humorous).
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
'inside' is an insertion indicator.
The alternate letters of 'eases' are 'ess'.
'dry' enclosing 'ess' is 'DRESSY'.
'and' is the link.
(Other definitions for dressy that I've seen before include "swish" , "(Of clothes) smart, formal" , "Stylishly attired" , "Smartly clad, wearing stylish clothes" , "Smartly attired, wearing stylish clothes" .)