Can one not do so without a hitch? (5)

I believe the answer is:

marry

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'hitch?' is the definition.
(thesaurus)

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

(Other definitions for marry that I've seen before include "Well I never!" , "Tie the knot; why! (Shak.)" , "Gain a wife or husband" , "Join - get wed" , "Get hitched" .)

I've seen this clue in the Evening Standard.

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