Crossword Genius

When her aim is spoilt, she’s still a bit amiable (3)

Ross

I believe the answer is:

mia

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

'when her aim' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.

'spoilt she's still a bit amiable' is the wordplay.
'MIA' is hidden within the letters.
But, I'm unsure how this is indicated.

'is' is the link.

Can you help me to learn more?

(Other definitions for mia that I've seen before include "girl" , "- - Farrow, actress" .)

I've seen this clue in the Evening Standard.
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