Wasted time in British Library with old religious texts from the east (6)
I believe the answer is:
blotto
'wasted' is the definition.
(both can mean drunk)
'time in british library with old religious texts from the east' is the wordplay.
'time in british library' becomes 'blt' (I can't explain this - if you can you should give a lot more credence to this answer).
'with' means one lot of letters goes inside another.
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'religious texts' becomes 'OT' (Old Testament).
'from the east' says the letters should be written in reverse (on a map from right to left).
'ot' in reverse letter order is 'to'.
'blt' going around 'o' is 'blot'.
'blot'+'to'='BLOTTO'
Can you help me to learn more?
(Other definitions for blotto that I've seen before include "Smashed" , "As one plastered" , "wrecked" , "Blind drunk" , "under the table" .)