Pamphlet tersely conveys messages (7)

I believe the answer is:

letters

'messages' is the definition.
(I know this)

'pamphlet tersely conveys' is the wordplay.
'conveys' indicates the answer is hidden within the clue.
'LETTERS' is hidden in the letters of 'pamphlet tersely'.

(Other definitions for letters that I've seen before include "Correspondence" , "...as, for example" , "Characters" , "They are bound to look after tenants" , "Written notes" .)

I've seen this clue in The Everyman puzzle in The Observer.

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