Crossword Genius

Miss show that is holding auction (10)

Ross

I believe the answer is:

demoiselle

'miss' is the definition.
(demoiselle is a kind of miss)

'show that is holding auction' is the wordplay.
'show' becomes 'demo' (I've seen this before).
'that is' becomes 'ie' (abbreviation for id est, 'that is' in Latin).
'holding' is an insertion indicator.
'auction' becomes 'sell' (I've seen this in another clue).
'ie' enclosing 'sell' is 'iselle'.
'demo'+'iselle'='DEMOISELLE'

(Another definition for demoiselle that I've seen is " Young woman (archaic)".)

I've seen this clue in The Guardian.
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