A light orchestra's prominence (3)

I believe the answer is:

tor

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

'prominence' is the definition.
(I've seen this in another clue)

'a light orchestra's' is the wordplay.
'TOR' is hidden within the letters.
However, I am uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for tor that I've seen before include "Rot on a Cornish hill" , "feature of Glastonbury" , "Rot on a hill in Devon" , "Pillar of rock" , "Hill or rocky peak" .)

I've seen this clue in the Evening Standard.

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