The most common and most likely answer to this crossword clue is the 7 letter word DYNAMIC
I've seen this crossword clue in The Times
D
Y
N
A
M
I
C
More clues leading to the result DYNAMIC
- Energetic backing for detectives arresting large numbers
- Damn icy winds, with great strength
- Forceful police seizing loads to be returned
- Forceful detectives arrested a lot on their return
- Driving mounted policemen around a lot
- Active promotion for several in police department
- Forceful officers seizing loads from the east
- Lively game, Andy Murray primarily in charge
- Lots in police will get backing to be forceful
- Lots in detective team coming back with force
Buddy explains!

The straight part
We know that "with great strength" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with great strength = dynamic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does DYNAMIC mean?
DYNAMIC noun- A characteristic or manner of an interaction; a behavior.
- A moving force.
- The varying loudness or volume of a song or the markings that indicate the loudness.
- A symbol in a musical score that indicates the desired level of volume.
- (grammar) A verb that indicates continued or progressive action on the part of the subject.
- Changing; active; in motion.
- Powerful; energetic.
- Able to change and adapt.
- Having to do with the volume of sound.
- Happening at runtime instead of being predetermined at compile time.
- Pertaining to dynamics, the branch of mechanics concerned with the effects of forces on the motion of objects.
- (grammar) Of a verb: not stative, but fientive; indicating continued or progressive action on the part of the subject.