Posted in tens? (4)

I believe the answer is:

sent

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

'posted' is the definition.
('send' can be a synonym of 'post')

'tens?' is the wordplay.
'tens' anagrams to 'SENT'.
Though, I'm not clear how this is indicated.

'in' acts as a link.

Can you help me to learn more?

(Other definitions for sent that I've seen before include "Remitted" , "old money in Tallinn" , "Thrilled" , "Transmitted" , "Caused to go somewhere" .)

I've seen this clue in the Evening Standard.

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