It's in difficult roles that one maybe makes little progress (7)
I believe the answer is:
loiters
'one maybe makes little progress' is the definition.
I can't tell whether this defines the answer.
'it's in difficult roles' is the wordplay.
'in' means one lot of letters goes inside another.
'difficult' indicates anagramming the letters.
'roles' anagrammed gives 'loers'.
'it' inserted inside 'loers' is 'LOITERS'.
'that' is the link.
Can you help me to learn more?
(Other definitions for loiters that I've seen before include "Waits idly" , "Hangs around" , "dawdles" , "Hangs about idly" , "Hangs about with toilers" .)