It blooms in a monastery garden (5)

I believe the answer is:

aster

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

'it blooms' is the definition.
The definition suggests a singular noun which matches the answer.

'in a monastery garden' is the wordplay.
'in' indicates the answer is hidden within the clue.
'ASTER' is hidden in the letters of 'monastery garden'.

Can you help me to learn more?

(Other definitions for aster that I've seen before include "Daisy-like garden flower" , "Stare (anag.)" , "Christmas daisy" , "eg Michaelmas daisy" , "Plant like a Michaelmas daisy" .)

I've seen this clue in the Evening Standard.

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