Crossword Genius

In a monastery garden? (5)

Ross

I believe the answer is:

aster

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

'garden?' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'in a monastery' is the wordplay.
'in' says the answer is hidden in the clue.
'ASTER' is hidden in the letters of 'monastery'.

Can you help me to learn more?

(Other definitions for aster that I've seen before include "Showy garden flower" , "eg Michaelmas daisy" , "bloomer" , "Plant of Michaelmas daisy family" , "Tears about bright flower" .)

I've seen this clue in the Evening Standard.
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