Two gents on air possibly a wonderful thing (4)
I believe the answer is:
lulu
'a wonderful thing' is the definition.
(I've seen this before)
'two gents on air' is the wordplay.
'two' shows that letters should be duplicated.
'gents on air' becomes 'lu' (I can't explain this - if you can you should believe this answer much more).
'lu' doubled is 'LULU'.
'possibly' acts as a link.
Can you help me to learn more?
(Other definitions for lulu that I've seen before include "wonderful thing" , "Glaswegian 60s pop singer" , "modern opera" , "Outstanding person or thing" , "Berg's unfinished opera" .)