Gym apparatus? Lands with head lowered (6)

I believe the answer is:
horses
'head lowered' is the definition.
I can't tell whether this defines the answer.
'gym apparatus? lands' is the wordplay.
'gym apparatus?' becomes 'horse' (I've seen this before).
'lands' becomes 's' (I can't explain this - if you can you should believe this answer much more).
'horse'+'s'='HORSES'
'with' acts as a link.
Can you help me to learn more?
(Other definitions for horses that I've seen before include "See 1" , "Equine animals" , "Equine beasts" , "''If wishes were . . . . . ., beggars would ride''" , "Hoofed mammals (which go with 19 4)" .)
