Things wrong with cast: error in group of players (6,9)

I believe the answer is:

string orchestra

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

'group of players' is the definition.
'string orchestra' can be an answer for 'players' (I've seen this before). I am unsure of the 'group of' bit.

'things wrong with cast error' is the wordplay.
'wrong with' indicates an anagram.
'cast'+'error'='casterror'
'things' with its letters anagrammed with 'casterror' can make 'STRING ORCHESTRA'.

'in' is the link.

Can you help me to learn more?

(Other definitions for string orchestra that I've seen before include "Players" , "group" .)

I've seen this clue in The Telegraph.

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