Two poor grades given to poet 'to make you warm up' (7)

I believe the answer is:

defrost

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'warm up' is the definition.

'two poor grades given to poet' is the wordplay.
'two poor grades' becomes 'de'.
'given to' means one lot of letters go next to another.
'poet' becomes 'frost' (Frost is an example).
'de'+'frost'='DEFROST'

'to make you' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for defrost that I've seen before include "Thaw (frozen food)" , "Make free of ice" .)

I've seen this clue in The Everyman puzzle in The Observer.

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