Context:
Embattled City in Syria Simmers as Monitors Enter
By KAREEM FAHIM 3 minutes ago
The Syrian government pulled tanks from the streets of Homs on Tuesday as Arab League observers arrived to monitor government pledges to withdraw forces.
If your question is " simmer = to be in a simmer of distress", the answer is 'no'.
Context is always important; labelling is rarely important.
Thanks
But I need a yes reply. What does "simmer" mean there?
Have a look at the second definition in this link: simmer verb - definition in British English Dictionary & Thesaurus - Cambridge Dictionary Online