Crossword Genius

What to do when she's cold? (7)

Ross

I believe the answer is:

heather

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

'cold?' is the definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe there's a link between them I don't understand?

'what to do when she's' is the wordplay.
I cannot really understand how this works, but
'she' could be 'heath' and 'heath' is present in the answer.
The remaining letters 'er' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for heather that I've seen before include "Ericaceous shrub" , "growing up on the moors" , "Calluna vulgaris" , "Moorland shrub" , "Erica!" .)

I've seen this clue in the Evening Standard.
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