Article taken by boat? I should think so (3,3)

I believe the answer is:

and how

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'i should think so' is the definition.
I can't tell whether this definition defines the answer.

'article taken by boat?' is the wordplay.
'article' becomes 'an' (indefinite article).
'taken by' says to put letters next to each other.
'boat?' becomes 'dhow' (dhow is a kind of sailing vessel**).
'an'+'dhow'='AND HOW'

Can you help me to learn more?

(Another definition for and how that I've seen is " Certainly".)

I've seen this clue in The Independent.

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