Crossword Genius

Part of sombre hotel set up by Rosemary (4)

Ross

I believe the answer is:

herb

'rosemary' is the definition.
(thesaurus)

'part of sombre hotel set up' is the wordplay.
'part of' indicates a hidden word.
'set up' is a reversal indicator (in a down clue, letters go up).
'breh' is hidden within 'sombre hotel'.
'breh' backwards is 'HERB'.

'by' acts as a link.

(Other definitions for herb that I've seen before include "bay perhaps" , "Marjoram, say" , "ingredient for recipe?" , "Medicinal or culinary plant" , "Aromatic plant used in cookery" .)

I've seen this clue in The Irish Times.
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