The way fop ran certainly demonstrates proud gait (6)
I believe the answer is:
prance
'gait' is the definition.
(I know that prance is a type of gait)
'the way fop ran certainly demonstrates proud' is the wordplay.
'PRANCE' is hidden within the letters.
But, I am uncertain how this is indicated.
Can you help me to learn more?
(Other definitions for prance that I've seen before include "(Of horse) move with high steps" , "(Of horse) use high steps" , "Gambol" , "Swagger, cavort" , "Skip around like a horse" .)