Chap in charge getting mad (5)
I believe the answer is:
manic
'mad' is the definition.
(I've seen this before)
'chap in charge getting' is the wordplay.
'chap' becomes 'man' (chap can mean a man).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'getting' says to put letters next to each other.
'man'+'ic'='MANIC'
(Other definitions for manic that I've seen before include "Obsessive" , "Berserk" , "hyperactive?" , "Showing wild energy" , "Ludicrously busy" .)