Idea found in but little time (7)
I believe the answer is:
thought
'idea' is the definition.
(I know that idea can be written as thought)
'but little time' is the wordplay.
'but' becomes 'though' (I've seen this before).
'little time' becomes 't' (abbreviation for time).
'though'+'t'='THOUGHT'
'found in' is the link.
(Other definitions for thought that I've seen before include "Philosopher must master this" , "Notion" , "Fancy" , "Idea coming to mind" , "Mental idea" .)