Seriously troubled, Dutch heartily gets stuck into a fresh escalation (2,3)
I believe the answer is:
at war
'seriously troubled dutch' is the definition.
Although both the answer and definition are adjectives, I cannot see how one could define the other.
'heartily gets stuck into a fresh escalation' is the wordplay.
'heartily' indicates the central letters (the inside or heart of the word).
'gets' becomes 'draws in' (drawing in is a kind of getting).
'stuck into' means one lot of letters goes inside another.
'a fresh escalation' becomes 'atar' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
The central letter of 'drawsin' is 'w'.
'w' placed within 'atar' is 'AT WAR'.
Can you help me to learn more?
(Another definition for at war that I've seen is " In conflict".)