Getting hitched, having an affection for (10)

I believe the answer is:

attachment

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'getting' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe there's an association between them I don't understand?

I don't understand the remainder of the clue.

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(Other definitions for attachment that I've seen before include "Fond regard" , "communicated via e-mail" , "what might accompany 50 [EMAIL]" , "Means of securing" , "File with an email" .)

I've seen this clue in the Evening Standard.

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