Lover of one kind of meat sent back another kind (7)
I believe the answer is:
leander
'lover' is the definition.
(I've seen this before)
'one kind of meat sent back another kind' is the wordplay.
'one kind of meat' becomes 'lean' (I've seen this in another clue).
'sent back' shows that the letters should be reversed in order.
'another kind' becomes 'red' (I can't explain this - if you can you should give a lot more credence to this answer).
'red' written backwards gives 'der'.
'lean'+'der'='LEANDER'
'of' acts as a link.
Can you help me to learn more?
(Other definitions for leander that I've seen before include "Hero-worshipper" , "He swam for love" , "Oarsmen" , "Ill-fated lover" , "man who went under" .)