Crossword Genius

Obtain bum cream and lotions originally for nursery (9)

Ross

I believe the answer is:

botanical

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'obtain bum cream and lotions originally for nursery' is the definition.
I can't tell whether this definition defines the answer.

'obtain bum cream and lotions originally' is the wordplay.
'bum' is an anagram indicator (bum can mean faulty or wrong).
'originally' says to take the initial letters.
The first letters of 'cream and lotions' is 'cal'.
'obtain' is an anagram of 'botani'.
'botani'+'cal'='BOTANICAL'

Can you help me to learn more?

(Other definitions for botanical that I've seen before include "Description of some gardens" , "(Gardens) of scientific interest" , "Relating to the study of plants" .)

I've seen this clue in The Guardian.
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