What does the cryptic crossword clue "Scott's companion, devouring lots of dessert and biscuits (8)" mean?

The wordplay uses a container (one word inside another). CAK (synonym="CAK") in OATES (synonym="OATES") = OATCAKES The answer is OATCAKES.

Scott's companion, devouring lots of dessert and biscuits (8)

Guardian Cryptic #26288 | 24 Across | 2014-06-17 flower