Very old script at hand in library (6,1)
I believe the answer is:
linear b
'very old script' is the definition.
'linear b' can be an answer for 'script' (I have seen 'Old script' mean 'linear b' so perhaps 'script' could also mean 'linear b'). I'm unsure of the 'very old' bit.
'at hand in library' is the wordplay.
'at hand' becomes 'near' (I've seen this in another clue).
'in' is an insertion indicator.
'library' becomes 'lib' (short for library).
'near' going within 'lib' is 'LINEAR B'.
Can you help me to learn more?
(Other definitions for linear b that I've seen before include "Early signs" , "Ancient Minoan script" , "Ancient writing used at Knossos" , "Old script" .)