Crossword Genius

Schoolmaster's bloomer? (5)

Ross

I believe the answer is:

aster

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

'bloomer?' is the definition.
(I know that aster is a type of bloomer)

'schoolmaster's' is the wordplay.
'ASTER' is hidden in amongst the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for aster that I've seen before include "Purple pink flowered plant" , "Plant of Michaelmas daisy family" , "Flowering plant; tares (anag.)" , "Flower of the daisy family - rates (anag)" , "eg Michaelmas daisy" .)

I've seen this clue in the Evening Standard.
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