Rodent seen when Frankie's chums go cycling (4,3)
I believe the answer is:
pack rat
'rodent' is the definition.
(pack rat is a kind of rodent)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for pack rat that I've seen before include "Bushy-tailed creature" , "Scavenger" , "Rodent" .)