Forceful policemen holding loads up (7)
I believe the answer is:
dynamic
'forceful' is the definition.
(similar in meaning)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for dynamic that I've seen before include "Very active" , "Vigorous and effective" , "Having power" , "Full of energy and ideas" , "Vigorous and go-ahead" .)