Creature found in group (6)
I believe the answer is:
insect
'creature' is the definition.
(insect is a kind of animal)
'in group' is the wordplay.
'group' becomes 'sect' (I've seen this in other clues).
'in'+'sect'='INSECT'
'found' acts as a link.
(Other definitions for insect that I've seen before include "Praying mantis, say" , "Fly, say?" , "Small air-breathing arthropod" , "Possibly fly" , "Eg, beetle or fly" .)