Crossword Genius

An engagement one can look up (3)

Ross

I believe the answer is:

gig

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'an engagement' is the definition.
(gig is a kind of engagement)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for gig that I've seen before include "Live performance by musicians" , "Small horse-drawn carriage" , "One-horse carriage" , "Band performance" , "One-night stand" .)

I've seen this clue in the Evening Standard.
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