Period of abstinence, stopping at home, in prospect for Carol (6,5)
I believe the answer is:
silent night
'carol' is the definition.
(I've seen this before)
'period of abstinence stopping at home in prospect' is the wordplay.
'period of abstinence' becomes 'lent' (I've seen this before).
'stopping' means one lot of letters goes inside another (stopping can mean blocking a gap).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'in' indicates putting letters inside.
'prospect' becomes 'sight' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'lent' put inside 'in' is 'ilentn'.
'ilentn' placed within 'sight' is 'SILENT NIGHT'.
'for' acts as a link.
Can you help me to learn more?
(Other definitions for silent night that I've seen before include "Blood sucking mammals" , "Christmas carol - hours of undisturbed sleep?" .)