Rotten goalie essentially rubbish (5)
I believe the answer is:
offal
'rubbish' is the definition.
(I've seen this in another clue)
'rotten goalie essentially' is the wordplay.
'rotten' becomes 'off' (rotten food is 'off').
'essentially' says to take the centre.
The middle of 'goalie' is 'al'.
'off'+'al'='OFFAL'
(Other definitions for offal that I've seen before include "Edible (or inedible?) internal organs" , "Liver, kidneys etc - rubbish" , "Liver, lungs etc" , "Liver, kidney, etc, as food" , "Edible entrails of animals" .)