Crossword Genius

Lament nun's straying and dissolution (9)

Ross

I believe the answer is:

annulment

'dissolution' is the definition.
(annulment is a kind of dissolution)

'lament nun's straying' is the wordplay.
'straying' indicates an anagram.
'lament'+'nun'='lamentnun'
'lamentnun' is an anagram of 'ANNULMENT'.

'and' is the link.

(Other definitions for annulment that I've seen before include "Declaration of invalidity, of a marriage say" , "dissolution" , "cancellation" , "recall" , "Invalidation" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app