Crossword Genius

Monastic call is to source of religion, possibly (9)

Ross

I believe the answer is:

cloistral

'monastic' is the definition.
('cloistral' can be a synonym of 'monastic')

'call is to source of religion possibly' is the wordplay.
'source of' says to take the initial letters.
'possibly' is an anagram indicator.
The first letter of 'religion' is 'r'.
'call'+'is'+'to'+'r'='callistor'
'callistor' is an anagram of 'CLOISTRAL'.

I've seen this clue in The Independent.
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