Style of writing suitable for circular letters? (5,4)

I believe the answer is:

round hand

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'style of writing suitable' is the definition.
I can't tell whether this definition defines the answer.

'circular letters?' is the wordplay.
'circular' becomes 'round' (synonyms).
'letters?' becomes 'hand' (I can't justify this - if you can you should give a lot more credence to this answer).
'round'+'hand'='ROUND-HAND'

'for' is the link.

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I've seen this clue in The Globe and Mail.

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