Police chief wandering around and finding evidence (7)
I believe the answer is:
proving
'and finding evidence' is the definition.
I can't tell whether this definition defines the answer.
'police chief wandering' is the wordplay.
'chief' says to take the initial letters (the letter which leads the word).
'wandering' becomes 'roving' (synonyms).
The first letter of 'police' is 'p'.
'p'+'roving'='PROVING'
'around' acts as a link.
Can you help me to learn more?
(Another definition for proving that I've seen is " Showing to be true".)