Resident switching from can to cup (8)
I believe the answer is:
occupant
'resident' is the definition.
(I know that resident can be written as occupant)
'from can to cup' is the wordplay.
'from' indicates anagramming the letters (the anagram comes from the same letters).
'can'+'to'+'cup'='cantocup'
'cantocup' with letters rearranged gives 'OCCUPANT'.
'switching' acts as a link.
I am not very happy about this link. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for occupant that I've seen before include "One holding position or residing in house" , "Person residing in a property" , "Indweller" , "Holder of a position or office" , "Inhabitant, resident" .)