Question worker sceptically (6)
I believe the answer is:
askant
'sceptically' is the definition.
(I've seen this before)
'question worker' is the wordplay.
'question' becomes 'ask' (asking a question).
'worker' becomes 'ant' (worker is a type of ant).
'ask'+'ant'='ASKANT'
(Other definitions for askant that I've seen before include "Showing doubt" , "showing suspicion" , "Sceptically" , "awry" , "With an oblique glance" .)