Crossword Genius

Cover up, lady; the heat is off (7)

Ross

I believe the answer is:

sheathe

I'm a little stuck... Click here to teach me more about this clue!

'cover' is the definition.
(to sheathe something is to cover it)

'up lady the heat is off' is the wordplay.
'up lady' becomes 'she' ('she' refers to a woman. I am not sure about the 'up' bit.).
'is off' is an anagram indicator.
'heat' with letters rearranged gives 'athe'.
'she'+'athe'='SHEATHE'

Can you help me to learn more?

(Other definitions for sheathe that I've seen before include "Put (a sword) it its cover" , "Protective cover, for sword say" , "Put (a sword) into case" , "Put away (a sword)" , "Encase in protection" .)

I've seen this clue in the Evening Standard.
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