Encouraged war reporter encircling ancient hideout one duke's abandoned (10)
I believe the answer is:
emboldened
'encouraged' is the definition.
(emboldening is a kind of encouraging)
'war reporter encircling ancient hideout one duke's abandoned' is the wordplay.
I cannot really see how this works, but
'ancient' could be 'olden' (as in the olden days) and 'olden' is located in the answer.
'duke' could be 'd' (abbreviation) and 'd' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Another definition for emboldened that I've seen is " Given courage".)