Girl by a road finds creature (6)
I believe the answer is:
lizard
'creature' is the definition.
(lizard is a kind of animal)
'girl by a road' is the wordplay.
'girl' becomes 'liz' (short for Elizabeth).
'by' is a charade indicator (letters next to each other).
'road' becomes 'rd' (abbreviation).
'liz'+'a'+'rd'='LIZARD'
'finds' acts as a link.
(Other definitions for lizard that I've seen before include "Reptile with two pairs of legs" , "Gecko, chameleon or monitor?" , "Reptile with four legs and a tapering tail" , "Reptile with four legs and long tail" , "part of Cornish coast" .)