Eg Astaire and Rogers often consuming last of tinned fruit (8)

'fruit' is the definition.
(cooking apple)

'eg astaire and rogers often consuming last of tinned' is the wordplay.
'eg astaire and rogers often' becomes 'co-stars'.
'consuming' means one lot of letters goes inside another.
'last of' says to take the final letters.
The last letter of 'tinned' is 'd'.
'costars' placed around 'd' is 'COSTARDS'.