A vicar strayed and came close to sin (7)
I believe the answer is:
avarice
'sin' is the definition.
(avarice is a kind of sin)
'a vicar strayed and came close to' is the wordplay.
'strayed' indicates anagramming the letters.
'and' is a charade indicator (letters next to each other).
'close to' indicates one should take the final letters (the close/ending of).
The last letter of 'came' is 'e'.
'vicar' anagrammed gives 'varic'.
'a'+'varic'+'e'='AVARICE'
(Other definitions for avarice that I've seen before include "Greed, covetousness" , "Insatiable lust" , "excessive desire for wealth" , "Excessive greed for wealth" , "Wanting to be rich" .)