Pluck shown by all leading toxophilites when arrow nears gold (5)
I believe the answer is:
twang
'pluck' is the definition.
(as in twanging or plucking a guitar string)
'all leading toxophilites when arrow nears gold' is the wordplay.
'all leading' suggests taking the first letters (letters which lead the words).
The first letters of 'toxophilites when arrow nears gold' is 'TWANG'.
'shown by' acts as a link.
(Other definitions for twang that I've seen before include "Regional intonation" , "Local intonation" , "The Sound of Music?" , "Distinctive nasal style of pronunciation" , "Plucking sound - nasal tone" .)