Firestarter concealed in concert orchestra (5)

I believe the answer is:

torch

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

'firestarter concealed' is the definition.
I can't judge whether this defines the answer.

'in concert orchestra' is the wordplay.
'in' indicates a hidden word.
'TORCH' is hidden within 'concert orchestra'.

Can you help me to learn more?

(Other definitions for torch that I've seen before include "Set fire to - hand-held light" , "A large candle" , "Small hand-held battery lamp" , "Set alight deliberately" , "Source of light" .)

I've seen this clue in The Sun.

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