Reg hops about finding burrowing rodents (7)
I believe the answer is:
gophers
'rodents' is the definition.
(gopher is a kind of rodent)
'reg hops about' is the wordplay.
'about' indicates an anagram.
'reg'+'hops'='reghops'
'reghops' anagrammed gives 'GOPHERS'.
'finding burrowing' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for gophers that I've seen before include "Computer browsers" , "waffles" , "Creatures" .)