Pierrot, oddly saucy (4)
I believe the answer is:
pert
'saucy' is the definition.
(synonyms)
'pierrot oddly' is the wordplay.
'oddly' indicates alternate letters (letters in the odd-numbered positions are used).
The alternating letters of 'pierrot' are 'PERT'.
(Other definitions for pert that I've seen before include "Persian expert" , "Irreverent or saucy" , "Jaunty" , "It's fresh" , "Saucy, lively" .)