Bishop and clergyman meeting father, brought up a way of modifying terms (6)
I believe the answer is:
adverb
'a way of modifying terms' is the definition.
I can't judge whether this definition defines the answer.
'bishop and clergyman meeting father brought up' is the wordplay.
'bishop' becomes 'B' (abbreviation for bishop in chess).
'and' means one lot of letters go next to another.
'clergyman meeting' becomes 'rev' (I can't justify this - if you can you should believe this answer much more).
'father' becomes 'da' (da can mean dad).
'brought up' shows that the letters should be reversed in order (in a down clue, letters go up).
'rev'+'da'='revda'
'revda' backwards is 'adver'.
'b' after 'adver' is 'ADVERB'.
Can you help me to learn more?
(Other definitions for adverb that I've seen before include "Word such as 'madly'" , "Word modifying another" , "Rarely is one" , ""Quickly" is one, for example" , "Word such as "quickly"" .)