21A Vivaporous blenny, small broad-headed fish found in cold seas. (7) **L***T. The only 7 letter word that I can find is "Zoarces" but it doesn't fit! Thanks in advance.
according to Britannica - eelpout ...."any of about 80 species of elongated marine fishes of the family Zoarcidae, found in cold waters and abundant in the Arctic & Antarctic regions"