Sort of blue when meeting delightful bully (9)
I believe the answer is:
persecute
'bully' is the definition.
(thesaurus)
'sort of blue when meeting delightful' is the wordplay.
'sort of blue' becomes 'perse' (I can't justify this - if you can you should give a lot more credence to this answer).
'when meeting' says to put letters next to each other.
'delightful' becomes 'cute' (I've seen this in other clues).
'perse'+'cute'='PERSECUTE'
Can you help me to learn more?
(Other definitions for persecute that I've seen before include "Harass for reasons of politics, religion etc" , "Dog" , "hound" , "Persistently harass" , "victimise" .)