Moving, large book about Scottish island lake (9)
I believe the answer is:
emotional
'moving' is the definition.
('emotional' is associated in meaning with 'moving')
'large book about scottish island lake' is the wordplay.
'large book' becomes 'tome' (I've seen this before).
'about' shows that the letters should be reversed in order.
'scottish island' becomes 'iona' (I've seen this before).
'lake' becomes 'l'.
'tome' reversed gives 'emot'.
'emot'+'iona'+'l'='EMOTIONAL'
(Other definitions for emotional that I've seen before include "Arousing intense feelings" , "Moved" , "Touching" , "Arousing intense feeling" , "Deeply feeling" .)