Ambitions: Stevie Nicks's song (6)

I believe the answer is:

dreams

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'ambitions' is the definition.
('dream' can be a synonym of 'ambition')

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for dreams that I've seen before include "Thoughts and visions during sleep" , "Imaginings" , "'We are such stuff / As dreams are made on' (The Tempest)" , "'''We are such stuff as ... are made on'' The Tempest (6)'" , "Fantasies; fantasises" .)

I've seen this clue in The Sun.

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