Conceal rest EEC produced (7)
I believe the answer is:
secrete
'conceal' is the definition.
(I know that secrete is a type of conceal)
'rest eec produced' is the wordplay.
'produced' is an anagram indicator.
'rest'+'eec'='resteec'
'resteec' with letters rearranged gives 'SECRETE'.
(Other definitions for secrete that I've seen before include "(Of gland) produce (a substance)" , "Hide - discharge" , "Hide or conceal an object" , "Cache" , "Hide; as gland does" .)