Harry’s son left England (6)
I believe the answer is:
hassle
'harry's' is the definition.
(synonyms)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for hassle that I've seen before include "Annoy continually" , "Informally, annoy or harass" , "Pester or annoy" , "Harass; pester" , "Difficulty - dispute" .)