A learner taken in by great rogue in general (2,5)
I believe the answer is:
at large
'in general' is the definition.
('at large' can be a synonym of 'in general')
'a learner taken in by great rogue' is the wordplay.
'learner' becomes 'l'.
'taken in by' indicates putting letters inside.
'rogue' indicates anagramming the letters.
'great' with letters rearranged gives 'targe'.
'l' placed within 'targe' is 'tlarge'.
'a'+'tlarge'='AT-LARGE'
(Other definitions for at large that I've seen before include "As a body" , "Free, maybe escaped" , "Glare at, being free and not confined" , "At liberty, escaped" , "Prisoner would rather be this" .)