Soldiers knocked over - that's horrible part of course (5)
I believe the answer is:
rough
'course' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'soldiers knocked over that's horrible' is the wordplay.
'soldiers' becomes 'OR' (Other Ranks).
'knocked over' says the letters should be written in reverse.
'that's horrible' becomes 'ugh' (expression of disgust).
'or' written backwards gives 'ro'.
'ro'+'ugh'='ROUGH'
'part of' acts as a link.
Can you help me to learn more?
(Other definitions for rough that I've seen before include "'Coarse, rugged (5)'" , "Unpolished" , "Approximate - rudimentary" , "Uneven - approximate - stormy" , "Approximate; hooligan" .)