Nice safe sort of girls to marry (8)

I believe the answer is:

fiancees

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'girls to marry' is the definition.
I can't tell whether this definition defines the answer.

'nice safe sort' is the wordplay.
'sort' is an anagram indicator.
'nice'+'safe'='nicesafe'
'nicesafe' with letters rearranged gives 'FIANCEES'.

'of' is the link.

Can you help me to learn more?

(Another definition for fiancees that I've seen is " Girls engaged".)

I've seen this clue in The Globe and Mail and The Guardian.

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