Trot in, somehow, like a sea god (6)
I believe the answer is:
triton
'sea god' is the definition.
(figure of Greek myth)
'trot in somehow' is the wordplay.
'somehow' indicates an anagram.
'trot'+'in'='trotin'
'trotin' is an anagram of 'TRITON'.
'like a' is the link.
(Other definitions for triton that I've seen before include "Son of Poseidon, shown as man with fish's tail with trident and shell-trumpet" , "conch-blowing deity" , "Greek sea-god like man with fish's tail, trident and shelltrumpet" , "heavenly conch-blower" , "Satellite of Neptune - minor sea god" .)