Worry of short show before noon (7)

I believe the answer is:

concern

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'worry' is the definition.
(synonyms)

'short show before noon' is the wordplay.
'short' means to remove the last letter.
'show' becomes 'concert' (concert is a kind of show).
'before noon' becomes 'n' (I can't justify this - if you can you should give a lot more credence to this answer).
'concert' with its last letter taken away is 'concer'.
'concer'+'n'='CONCERN'

'of' acts as a link.

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(Other definitions for concern that I've seen before include "Affair" , "Business organisation" , "Relate to; care" , "Feeling of anxiety or sympathy" , "Have something to do with" .)

I've seen this clue in The Telegraph.

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