Maybe Gordon put family jewels on display? (5)
I believe the answer is:
flash
This clue is a double definition.
'maybe gordon' is the first definition.
(Flash Gordon)
'put family jewels on display?' is the second definition.
(to flash can mean to expose one's genitals)
(Other definitions for flash that I've seen before include "Instant" , "- - of lightning" , "Momentary brightness" , "Streak" , "Conspicuously display" .)