Crossword Genius

Inform about gins (4)

Ross

I believe the answer is:

sing

I'm a little stuck... Click here to teach me more about this clue!

'inform' is the definition.
(I know that sing is a more specific form of tell)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for sing that I've seen before include "Act as informer" , "pipe" , "Perform (a song)" , "Celebrate" , "Grass" .)

I've seen this clue in The Mirror.
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