Campanologist's permutations? Attempts to keep place (7)
I believe the answer is:
triples
'campanologist's permutations?' is the definition.
I can't judge whether this defines the answer.
'attempts to keep place' is the wordplay.
'attempts' becomes 'tries' ('try' can be a synonym of 'attempt').
'to keep' is an insertion indicator.
'place' becomes 'pl' (abbreviation used in postal addresses).
'tries' enclosing 'pl' is 'TRIPLES'.
Can you help me to learn more?
(Another definition for triples that I've seen is " big drinks".)