Iron, perhaps, with no time for breakfast (4)
I believe the answer is:
meal
'for breakfast' is the definition.
(thesaurus)
'iron perhaps with no time' is the wordplay.
'iron perhaps' becomes 'metal' (iron is a kind of metal).
'with no' indicates named letters should be taken away.
'time' becomes 't' (abbreviation).
'metal' with 't' taken away is 'MEAL'.
(Other definitions for meal that I've seen before include "Edible part of grain or pulse" , "Breakfast, lunch, supper" , "Breakfast, dinner or tea" , "Food taken at a particular time" , "Coarsely ground grain" .)