Ok. Here's my latest thoughts ...
Answers to the 6 clues that you gave could be "identical", "seminated", "unhitched", "imaginary", "oasthouse", "inspector". This would give column 2 spelling "denman" (a famous horse). However, I cannot see the name of a second horse in any other column. Are both horse names 6 letters long and/or are there other clues for other rows across?