Making unattractive maiden get out and celebrate (13)

I believe the answer is:

demagnetising

I'm a little stuck... Click here to teach me more about this clue!

'making unattractive' is the definition.
I can't judge whether this definition defines the answer.

'maiden get out and celebrate' is the wordplay.
'out' is an anagram indicator (out can mean wrong or inaccurate).
'and' says to put letters next to each other.
'celebrate' becomes 'sing' (I've seen this before).
'maiden'+'get'='maidenget'
'maidenget' anagrammed gives 'demagneti'.
'demagneti'+'sing'='DEMAGNETISING'

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I've seen this clue in The Times.

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