Daisy a stunner, lowering temperature (5)
I believe the answer is:
aster
'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" .)