Diamonds held in mobile units – one of those with crown jewels on display? (6)
I believe the answer is:
nudist
'one of those with crown jewels on display?' is the definition.
I can't tell whether this definition defines the answer.
'diamonds held in mobile units' is the wordplay.
'diamonds' becomes 'd' (abbreviation in bridge say).
'held in' indicates putting letters inside.
'mobile' is an anagram indicator (mobile can mean moving).
'units' is an anagram of 'nuist'.
'd' inserted within 'nuist' is 'NUDIST'.
Can you help me to learn more?
(Other definitions for nudist that I've seen before include "Streaker?" , "one whose barely seen" , "Person committed to going unclothed" , "Person who believes in going unclothed" , "I want to be 12 [NAKED]" .)