I believe the answer is:
'heart-rending' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for poignant that I've seen before include "Arousing sympathy, moving to the feelings" , "Touching - gin on tap (anag)" , "Sharply upsetting" , "Sharply, painfully emotive" , "Painfully emotional" .)