Dame's new fantasy sadly amounts to nothing (5,5,5)

I believe the answer is:

sweet fanny adams

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'to nothing' is the definition.
(I've seen this before)

'dame's new fantasy sadly' is the wordplay.
'sadly' indicates anagramming the letters.
'dames'+'new'+'fantasy'='damesnewfantasy'
'damesnewfantasy' with letters rearranged gives 'SWEET FANNY ADAMS'.

'amounts' acts as a link.
This may not be right. It may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for sweet fanny adams that I've seen before include "Nothing" , "Love" , "[NIX]" , "SFA" .)

I've seen this clue in The Guardian.

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