Crossword Genius

Write a number about a mountain chain (7)

Ross

I believe the answer is:

pennine

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'a mountain chain' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'write a number' is the wordplay.
'write' becomes 'pen' (synonyms).
'a number' becomes 'nine' (nine is a number).
'pen'+'nine'='PENNINE'

'about' acts as a link.

Can you help me to learn more?

(Other definitions for pennine that I've seen before include "The - Way, Britain's first long-distance footpath" , "Relating to English mountains" , "English mountain chain" .)

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