Top Co. do get about and find a mollusc (7)
I believe the answer is:
octopod
'a mollusc' is the definition.
(octopod is a kind of mollusc)
'top co do get about and' is the wordplay.
'top co do' anagrams to 'OCTOPOD'.
But, I'm not sure how this is indicated.
'find' acts as a link.
Can you help me to learn more?
(Other definitions for octopod that I've seen before include "mollusc" , "Eight-limbed creature" , "Eight-armed/footed" , "Eight-legged creature" .)