Spot the pair of them with author (9)

I believe the answer is:

marktwain

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'author' is the definition.
(I've seen this before)

'spot the pair' is the wordplay.
'spot' becomes 'mark' (I've seen this in other clues).
'the pair' becomes 'twain' (synonyms).
'mark'+'twain'='MARKTWAIN'

'of them with' is the link.
This may not be right. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Another definition for marktwain that I've seen is " author".)

I've seen this clue in The Irish Times.

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