Plans to return tinned meat (4)
I believe the answer is:
spam
'tinned meat' is the definition.
(tinned meat product)
'plans to return' is the wordplay.
'plans' becomes 'maps' (I've seen this in another clue).
'to return' says the letters should be written in reverse.
'maps' in reverse letter order is 'SPAM'.
(Other definitions for spam that I've seen before include "(Send) junk mail" , "Unwanted e-mails" , "Spiced ham" , "Tinned meat - unwanted email" , "Send unsolicited mail" .)