Crossword Genius

A spirit not likely to do much for the old? (6)

Ross

I believe the answer is:

ageist

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

'not likely to do much for the old?' is the definition.
I can't tell whether this defines the answer.

'a spirit' is the wordplay.
'spirit' becomes 'geist' (I've seen this before).
'a'+'geist'='AGEIST'

Can you help me to learn more?

(Other definitions for ageist that I've seen before include "Discriminating on the basis of years lived" , "being for youngsters only?" , "knocking down the old" , "against vets" , "One prejudiced on grounds of age" .)

I've seen this clue in The Times.
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