Small mountain railway carries a Clinton’s wife (7)

I believe the answer is:

hillary

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

'clinton's wife' is the definition.
I can't tell whether this defines the answer.

'small mountain railway carries a' is the wordplay.
'small mountain' becomes 'hill' (I've seen this before).
'railway' becomes 'ry' (abbreviation).
'carries' means one lot of letters go next to another (in a down clue, some letters go beneath others).
'ry' after 'a' is 'ary'.
'hill'+'ary'='HILLARY'

Can you help me to learn more?

(Another definition for hillary that I've seen is " Legendary climber".)

I've seen this clue in The Hindu.

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