Meet clergyman eating ice cream? On the contrary (7)
I believe the answer is:
convene
'meet clergyman' is the definition.
'convene' can be an answer for 'meet' (convening is a kind of meeting). I am not certain of the 'clergyman' bit.
'eating ice cream? on the contrary' is the wordplay.
'eating' means one lot of letters goes inside another.
'ice cream?' becomes 'cone' (cone can refer to an ice cream cone).
'on the contrary' becomes 'ven' (I can't explain this - if you can you should give a lot more credence to this answer).
'cone' enclosing 'ven' is 'CONVENE'.
(Other definitions for convene that I've seen before include "Bring together to meet" , "Call (meeting)" , "Muster" , "rally" , "Gather (for meeting)" .)