Everyone in GOP to move at speed (6)
I believe the answer is:
gallop
'move at speed' is the definition.
The definition and answer can be both acts as well as being singular nouns.
Perhaps they are linked in a way I don't understand?
'everyone in gop' is the wordplay.
'everyone' becomes 'all' (all people).
'in' is an insertion indicator.
'all' going inside 'gop' is 'GALLOP'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for gallop that I've seen before include "'At GPO, all can go at this pace (6)'" , "Faster than a canter" , "Fast pace (for horse)" , "All at GPO can go at this rate" , "Horse's gait" .)