Secret line-up as might gather in A-lists? (6,6)
I believe the answer is:
parade ground
'lists?' is the definition.
(thesaurus)
'secret line-up as might gather' is the wordplay.
I cannot quite understand how this works, but
'line' could be 'round' (round is a kind of line) and 'round' is located in the answer.
'as' could be 'eg' (I've seen this in other clues) and 'eg' is found within the answer.
This explanation may well be incorrect...
'in a' acts as a link.
Can you help me to learn more?
(Other definitions for parade ground that I've seen before include "Where troops muster" , "where there may be a muster" , "Place for drill" , "square" , "Military area" .)