Trotters supported animal home - after altruist, essentially gets out of practice (5)
I believe the answer is:
rusty
'out of practice' is the definition.
(synonyms)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for rusty that I've seen before include "showing sign of inactivity?" , "(Of iron) affected by damp" , "(Of iron) corroded" , "Stiff with age" , "Impaired through lack of use" .)