Like an easy job? Copper’s retiring (5)
I believe the answer is:
cushy
'like an easy job?' is the definition.
(cushy means easy or low-effort)
'copper's retiring' is the wordplay.
'copper' becomes 'cu' (chemical symbol).
'retiring' becomes 'shy' (I've seen this before).
'cu'+'shy'='CUSHY'
(Other definitions for cushy that I've seen before include "Comfortable" , "(Of situation) secure, easy (colloq.)" , "Undemanding, secure" , "Undemanding (slang)" , "16 21 [INDIAN IMPORT]" .)