Clue: Horse that flew sees winning post the way FT does (7)
Answer: PEGASUS
Explanation: Horse that flew sees winning post the way FT does (7)
 
PEG + AS US
 
The post you hit at the end of a game of croquet is called the PEG, therefore "winning post" = PEG
 
The "AS US" bit is clumsy, in my opinion.