Standard metal in rake (7)
I believe the answer is:
routine
'standard' is the definition.
(thesaurus)
'metal in rake' is the wordplay.
'metal' becomes 'tin' (tin is a kind of metal**).
'in' means one lot of letters goes inside another.
'rake' becomes 'roue' ('roue' can be a synonym of 'rake').
'tin' going inside 'roue' is 'ROUTINE'.
(Other definitions for routine that I've seen before include "Variety act" , "Fixed sequence of actions" , "Unvarying set of actions" , "As a rule" , "Typical -- in utero (anag)" .)