Temporarily secures what's said to be an obligation (5)

I believe the answer is:

tacks

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'temporarily secures' is the definition.
'tacks' can be an answer for 'secures' (tacking is a kind of securing). I am not sure about the 'temporarily' bit.

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

Can you help me to learn more?

(Other definitions for tacks that I've seen before include "Changes course" , "They secure" , "Approaches" , "Shorts nails with big heads" , "Drawing pins" .)

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

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