One who receives end of rapier? (6)
I believe the answer is:
fencer
'one who receives end of rapier?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'one who receives end of rapier?' is the wordplay.
'one who receives' becomes 'fence' (receiver of stolen goods).
'end of' indicates one should take the final letters.
The final letter of 'rapier' is 'r'.
'fence'+'r'='FENCER'
(Other definitions for fencer that I've seen before include "One encloses" , "He sports with the sword" , "Sporty type" , "One with flashing blade" , "Participant in swordplay" .)