It's in a new role that one can dally (6)
I believe the answer is:
loiter
'dally' is the definition.
(thesaurus)
'it's in a new role' is the wordplay.
'in' means one lot of letters goes inside another.
'a new' is an anagram indicator.
'role' anagrammed gives 'loer'.
'it' going inside 'loer' is 'LOITER'.
'that one can' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for loiter that I've seen before include "Linger, with intent perhaps" , "be on stand-by?" , "Linger aimlessly" , "Hang around, perhaps with intent" , "Mooch, hang around" .)