Collect maybe where light gets in through (6)
I believe the answer is:
prayer
'collect maybe' is the definition.
(I know that collect is a type of prayer)
'light gets in through' is the wordplay.
'light' becomes 'ray' (ray is a kind of light).
'gets in' indicates putting letters inside.
'through' becomes 'per' ('per' can mean through or by means of).
'ray' placed into 'per' is 'PRAYER'.
'where' is the link.
(Other definitions for prayer that I've seen before include "Orison" , "Small chance" , "Plea, invocation" , "An appeal to a deity" , "Collect - petition" .)