Represent department in charge of drilling (6)
I believe the answer is:
'represent' is the definition.
(depicting is a kind of representing)
'department in charge of drilling' is the wordplay.
'department' becomes 'dept'.
'in charge of' becomes 'ic'.
'drilling' indicates putting letters inside.
'dept' placed around 'ic' is 'DEPICT'.
(Other definitions for depict that I've seen before include "Sketch or describe" , "Show, illustrate" , "Give a description of" , "Draw, describe" , "Show[S]" .)