Crossword Genius

Sole relative climbing mountain rocks (6)

Ross

I believe the answer is:

plaice

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'sole relative' is the definition.
The answer and definition can be both animals as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'climbing mountain rocks' is the wordplay.
'climbing' shows that the letters should be reversed in order (in a down clue, letters climb up).
'mountain' becomes 'alp' (the Alps are a mountain range).
'rocks' becomes 'ice' (both can informally mean diamonds).
'alp' in reverse letter order is 'pla'.
'pla'+'ice'='PLAICE'

Can you help me to learn more?

(Other definitions for plaice that I've seen before include "Location of the fish" , "Flatfish, valued as food" , "The fish sounds as if it hits the spot" , "Large flat fish" , "A fish; sounds like put" .)

I've seen this clue in the Sydney Morning Herald.
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