Executive clubs, for example (4)
I believe the answer is:
suit
This clue is a double definition.
'executive' is the first definition.
(I've seen this before)
'clubs for example' is the second definition.
(clubs is a playing card suit)
(Other definitions for suit that I've seen before include "diamonds, perhaps" , "Formal wear (for court action?)" , "Set of cards" , "Formal wear for men" , "Petition" .)