Crossword Genius

Well, what to do with crumbling mortar is a painful subject (4,5)

Ross

I believe the answer is:

sore point

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'well what to do with crumbling mortar' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'painful subject' is the wordplay.
'painful' becomes 'sore' (synonyms).
'subject' becomes 'point' (I can't justify this - if you can you should give a lot more credence to this answer).
'sore'+'point'='SORE POINT'

'is a' acts as a link.

Can you help me to learn more?

(Other definitions for sore point that I've seen before include "Annoying issue" , "Touchy matter" , "grievance" .)

I've seen this clue in The Guardian.
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