Deal only half done -- is America involved in neglect? (6)
I believe the answer is:
disuse
'neglect?' is the definition.
(both can mean a state of disrepair)
'deal only half done is america involved' is the wordplay.
'only half done' means to take half the letters.
'america' becomes 'us' (United States).
'involved' indicates putting letters inside.
'deal' cut in half is 'de'.
'is'+'us'='isus'
'de' placed around 'isus' is 'DISUSE'.
'in' acts as a link.
(Other definitions for disuse that I've seen before include "State of not being employed" , "Neglect; desuetude" , "Issued (anag)" , "Fall into this state to be unemplyed? (6)." , "Neglect; abandonment" .)