Sharp stab of pain - one of a pair, for example, coming back (6)
I believe the answer is:
twinge
'sharp stab of pain one' is the definition.
I can't judge whether this defines the answer.
'a pair for example coming back' is the wordplay.
'a pair' becomes 'twin' (I've seen this before).
'for example' becomes 'e.g.' (short for 'exempli gratia', 'for example' in Latin).
'coming back' says the letters should be written in reverse.
'eg' reversed gives 'ge'.
'twin'+'ge'='TWINGE'
'of' is the link.
Can you help me to learn more?
(Other definitions for twinge that I've seen before include "A slight stab of pain" , "Qualm" , "A small pang, of pain or concience" , "little pain" , "Small pain eg from conscience" .)