Way to press button on watch for alarm call (5-5)

'alarm call' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.

'way to press button on watch' is the wordplay.
I cannot quite see how this works, but
an anagram of 'way' is 'ywa' which is located in the answer.
'watch' could be 'wake' (wake is a kind of watch) and 'wake' is present in the answer.
The remaining letters 'key' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

'for' is the link.

Can you help me to learn more?