They carve mother and child on the underside of rock (10)
I believe the answer is:
stonemason
'they carve' is the definition.
The definition suggests an adverb but the answer is not.
'mother and child on the underside of rock' is the wordplay.
'mother' becomes 'ma' (Ma is another word for mother or mum).
'and' says to put letters next to each other.
'child' becomes 'son' (male child).
'on' says to put letters next to each other.
'the underside of rock' becomes 'stone' (I can't justify this - if you can you should give a lot more credence to this answer).
'ma' put next to 'son' is 'mason'.
'mason' after 'stone' is 'STONEMASON'.
Can you help me to learn more?
(Other definitions for stonemason that I've seen before include "manual worker" , "Monumental worker" , "chipper?" , "Man's on toes (anag) - craftsman" , "Rock craftsman" .)