Pitiable soul told gag (5)
I believe the answer is:
retch
'gag' is the definition.
(I've seen this in other clues)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for retch that I've seen before include "Reach" , "throw up" , "Gag, near-vomit" , "Try to bring up" , "Try to be sick" .)