Very old Scottish chimney shown by English book (6)
I believe the answer is:
volume
'book' is the definition.
('volume' can be a synonym of 'book')
'very old scottish chimney shown by english' is the wordplay.
'very' becomes 'v' (abbreviation).
'old' becomes 'o' (common abbreviation eg in OE for Old English).
'scottish chimney' becomes 'lum' (I've seen this before).
'shown by' means one lot of letters go next to another.
'english' becomes 'e' (abbreviation).
'v'+'o'+'lum'+'e'='VOLUME'
(Other definitions for volume that I've seen before include "Book; degree of loudness" , "A book, especially one of a set" , "Cubic capacity" , "Space occupied by an object" , "size" .)