Crossword Genius

How happy cowboys might be? (7)

Ross

I believe the answer is:

trigger

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

This clue could be a double definition.

'how happy cowboys might' is the first definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'be?' is the second definition.
Although both the answer and definition are singular nouns, I can't see how one could define the other.

Can you help me to learn more?

(Other definitions for trigger that I've seen before include "Start" , "One pulled to fire" , "Activating device" , "Lever on gun" , "Component of gun" .)

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