Save up to get engaged (7)

I believe the answer is:

reserve

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'save up' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for reserve that I've seen before include "Conservation area" , "Keep for someone - spare bod" , "Save" , "One on bench" , "ice" .)

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

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