Beam of light reflected terrace's herbal plant (6)

I believe the answer is:

yarrow

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'herbal plant' is the definition.
'yarrow' can be an answer for 'plant' (yarrow is a kind of plant). I'm not sure about the 'herbal' bit.

'beam of light reflected terrace's' is the wordplay.
'beam of light' becomes 'ray' (synonyms).
'reflected' is a reversal indicator.
'terrace' becomes 'row'.
'ray' reversed gives 'yar'.
'yar'+'row'='YARROW'

Can you help me to learn more?

(Other definitions for yarrow that I've seen before include "Creeping perennial plant, used in herbal medicine" , "Creeping plant, also called milfoil" , "Wild aromatic plant" , "Pungent plant" , "This herb is strangely a worry" .)

I've seen this clue in The Times.

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