Clergyman addressed assistant going back to heartless primate with cold drink (6)
I believe the answer is:
frappe
'cold drink' is the definition.
(I've seen this in another clue)
'clergyman addressed assistant going back to heartless primate' is the wordplay.
'clergyman' becomes 'p' (abbreviation for priest).
'addressed assistant' becomes 'arf' (I can't justify this - if you can you should give a lot more credence to this answer).
'going back' says the letters should be written in reverse.
'to heartless' means to remove the middle letters.
'primate' with its middle removed is 'pe'.
'p'+'arf'='parf'
'parf' backwards is 'frap'.
'frap'+'pe'='FRAPPE'
'with' is the link.
Can you help me to learn more?
(Other definitions for frappe that I've seen before include "served cold" , "slushy drink" , "Iced coffee drink" , "Fruit drink frozen to a mush" , "Drink of liqueur poured over crushed ice" .)