Crossword Genius

Daisy a stunner, lowering temperature (5)

Ross

I believe the answer is:

aster

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

'daisy' is the definition.
(I've seen this before)

'a stunner lowering temperature' is the wordplay.
I cannot really understand how this works, but
'a' is found in the answer.
'temperature' could be 't' (abbreviation) and 't' is located in the answer.
The remaining letters 'ser' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for aster that I've seen before include "Flowering plant; tares (anag.)" , "Purple pink flowered plant" , "Daisy-like garden flower" , "Flower of the daisy family - rates (anag)" , "Garden plant" .)

I've seen this clue in The Times.
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