Biden's example of capacity to engage old loaf (6)
I believe the answer is:
loiter
'loaf' is the definition.
(I know that loaf can be written as loiter)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for loiter that I've seen before include "Hang around, lurk" , "Hang around, perhaps with intent" , "Wait suspiciously" , "Skulk" , "Stand around idly" .)