Minister caught Mary and Glen getting involved (9)
I believe the answer is:
clergyman
'minister' is the definition.
(I've seen this before)
'caught mary and glen getting involved' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'and' says to put letters next to each other.
'getting involved' is an anagram indicator (involved can mean confusing or complex).
'mary' after 'glen' is 'glenmary'.
'glenmary' anagrammed gives 'lergyman'.
'c'+'lergyman'='CLERGYMAN'
(Other definitions for clergyman that I've seen before include "Church official" , "Person of the cloth" , "professional person" , "Ordained minister" , "Man of the cloth" .)