Usually brilliant bit of management (3)
I believe the answer is:
'usually brilliant' is the definition.
'gem' can be an answer for 'brilliant' (I've seen this in another clue). I'm unsure of the 'usually' bit.
'bit of management' is the wordplay.
'bit of' indicates a hidden word.
'GEM' is hidden within 'management'.
Can you help me to learn more?
(Other definitions for gem that I've seen before include "36 Across or any other jewel" , "Half of 7 [SIGN OF THE ZODIAC]" , "Diamond, ruby, or emerald" , "Kindness; comfort (German)" , "A jewel of an Orangeman" .)