Chap shortly losing height (6)

I believe the answer is:
victor
'chap shortly losing height' is the definition.
'Victor' can be an answer for 'chap'. I'm not sure about the 'shortly losing height' bit.
'chap shortly losing height' is the wordplay.
'chap shortly' becomes 'Vic' (short for Victor; 'shortly' asks for an abbreviation).
'losing height' becomes 'tor' (I've seen this in another clue. I am not sure about the 'losing' bit.).
'vic'+'tor'='VICTOR'
Can you help me to learn more?
(Other definitions for victor that I've seen before include "Competitor who's first" , "Conqueror" , "Comms code for V" , "The . . . . . . comic with Alf Tupper" , "Champion" .)
