Keen on scripture, I love to absorb it (4)
I believe the answer is:
into
'keen on' is the definition.
(I've seen this before)
'scripture i love to absorb it' is the wordplay.
'scripture i' becomes 'in' (I can't justify this - if you can you should give a lot more credence to this answer).
'love' becomes 'o' (In tennis, 'love' means 'zero').
'to absorb' means one lot of letters goes inside another.
'it' becomes 't' (abbreviation. e.g. in 'tis).
'in'+'o'='ino'
'ino' going around 't' is 'INTO'.
Can you help me to learn more?
(Other definitions for into that I've seen before include "A fan of" , "Four this twelve is three" , "Keen on, colloquially" , "To a position inside" , "Teachers' trade union" .)