Crossword Genius

Target some Plantagenet's supporter? Not good! (4,5)

Ross

I believe the answer is:

aunt sally

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

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

'some plantagenet's supporter? not good' is the wordplay.
I cannot really see how this works, but
'some' could be 'a' and 'a' is present in the answer.
'supporter?' could be 'ally' (an ally is a friend or supporter) and 'ally' is located in the answer.
'not' could be 'nt' (synonyms) and 'nt' is located in the answer.
The remaining letters 'us' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for aunt sally that I've seen before include "Fairground game - target for insults" , "Family member" , "object of abuse" , "Lusty Lana as target of criticism or missiles" , "Female relation used as a target in throwing game" .)

I've seen this clue in The Times.
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